Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links, observed 2026-08-14T05:52:37.412931Z
Paper Citation Record · LEDGER
As of 16 August 2026, this Paper Citation Record lists 69 of 69 outbound references and 0 inbound Pith citation observations for arXiv:1909.00560.
A citation records a reference. It does not transfer a finding from one paper to another.
Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links, observed 2026-08-14T05:52:37.412931Z
One-hop event checks from named stored sources.
Source: scholarly_work_events, retraction_status_cache, observed 2026-08-15T06:32:42.880941+00:00
Pith citing papers itemized under the disclosed page cap.
Source: paper_references, paper_reference_links
A source-named dated measurement, never combined with another source.
Source: cited_works
69 of 69 outbound references displayed
External citation measurements
No source-named external measurement is stored.
Observation 49e57b60-0fdf-4389-81d4-e0b998400b65 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Toward a heterogeneous mist, fog, and cloud-based framework for the internet of healthcare things,
Reference 1
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation aa92cd70-411d-4167-93c3-eaa456baa880 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Iot connections outlook: Nb-iot and cat-m technologies will account for close to 45 percent of cellular iot connections in 2024
Reference 2
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation d59554f2-5914-4255-bba0-fe6d2eb3d260 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Mobile edge computing: A survey,
Reference 3
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 51d935d1-8cc3-4c98-a350-a5c7126b9067 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Application of Machine Learning in Wireless Networks: Key Techniques and Open Issues
Reference 4
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation c89e1cef-1573-4a23-a617-00458f81868f · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Deep learning for intelligent wireless networks: A comprehensive survey,
Reference 5
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation ebd6df38-a21f-4b11-bd49-58ca143f2112 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Artificial Neural Networks-Based Machine Learning for Wireless Networks: A Tutorial
Reference 6
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 9371b269-8207-4df4-9908-8cf84767c8cc · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Edge intelligence: Paving the last mile of artificial intelligence with edge computing,
Reference 7
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation f94b49bd-d7ae-451c-a14a-5a6bbc5b4af6 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Convergence of Edge Computing and Deep Learning: A Comprehensive Survey
Reference 9
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 00315b0e-e5f1-46d9-9deb-ab4b75f58e8b · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence OpenEI: An Open Framework for Edge Intelligence
Reference 10
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 259fe027-6058-4c1a-ab41-a41ba33e9bae · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Communication-efficient learning of deep networks from decentralized data,
Reference 11
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation ca673e63-b46c-4bed-a45a-74fbd6169947 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence A survey on internet of things: Architecture, enabling technologies, security and privacy, and applications,
Reference 12
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 9dd589fe-7e89-4a1f-9f21-32eac14fa181 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Uav communications for 5g and beyond: Recent advances and future trends,
Reference 13
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation ffe05449-d059-4e44-8c05-5a723c1e3667 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Uav-enabled wireless power transfer: Trajectory design and energy optimization,
Reference 14
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation c9dd62a1-cf15-46e7-9ec1-cad8f5cf8006 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Towards an Intelligent Edge: Wireless Communication Meets Machine Learning
Reference 15
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation edd70ae9-fb8f-4082-87fc-6612f9966324 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Caching in the sky: Proactive deployment of cache-enabled unmanned aerial vehicles for optimized quality-of-experience,
Reference 16
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 33709ddd-e01f-4765-921c-d238ef257850 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Revenue-driven service provisioning for resource sharing in mobile cloud computing,
Reference 17
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 229551d0-bc65-4d35-8731-6b6894cf2fe4 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Deep reinforcement learning-based mode selection and resource management for green fog radio access networks,
Reference 18
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 1f8d5d27-ff49-4390-8ba6-c818a2ec914b · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Composition- driven iot service provisioning in distributed edges,
Reference 20
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 65559ebc-1caf-47ea-89ed-12182f266810 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Mobility-aware service composition in mobile communities,
Reference 21
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation ca421ee9-0b35-4b4d-baae-2226ddeff6da · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Mobile service selection for composition: An energy consumption perspective,
Reference 22
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation c0cdecc8-da5d-4f2b-87d8-ee872c22d224 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Cooperative edge caching in user-centric clustered mobile networks,
Reference 23
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation b11dfd91-286b-4782-9610-38bd9270728c · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Qoe aware and cell capacity enhanced computation offloading for multi-server mobile edge computing systems with energy harvesting devices,
Reference 24
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 0a9336ac-744f-4300-9b24-db411b640a85 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Modern service industry and crossover services: Development and trends in china,
Reference 25
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 03ca1c2f-711b-4dd0-84ec-3e5ef2547ac1 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Learning- based computation offloading for iot devices with energy harvesting,
Reference 26
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 1fdfc351-6039-4c74-a611-fa92a405f1be · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Perfor- mance optimization in mobile-edge computing via deep reinforcement learning,
Reference 27
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation e426c7c5-9416-4595-9d52-3e28bc09b637 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence A mobility- aware cross-edge computation offloading framework for partitionable applications,
Reference 28
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation b91b9ea1-2c26-4537-a2f9-94ada6d7d4ab · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence A density-based offloading strategy for iot devices in edge computing systems,
Reference 29
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation cd86db7a-a361-4728-bf35-81415d50a75a · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Wireless Network Intelligence at the Edge
Reference 30
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 2d7b1b3b-09ff-4fab-bfbb-a9d18e99c35e · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Service selection for composition with qos correlations,
Reference 31
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation f00e9aeb-aab5-46cb-a360-85f472ccec9b · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Edge intelligence: On-demand deep learning model co-inference with device-edge synergy,
Reference 32
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation dbab3f87-97a0-4ac6-a5fb-39061e01faa7 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Dropout: A simple way to prevent neural networks from overfit- ting,
Reference 33
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation dba2a874-4d07-4f94-8a77-b45071354d6a · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Not Just Privacy: Improving Performance of Private Deep Learning in Mobile Cloud
Reference 34
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 3d845c3c-9b33-4fe6-bfce-f9c69802aca4 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Adaptive Precision CNN Accelerator Using Radix-X Parallel Connected Memristor Crossbars
Reference 35
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 6bf74710-4d51-451b-8314-870b78d11530 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Over-the-air Function Computation in Sensor Networks
Reference 36
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 8b0d4ded-11f3-4b53-ab3f-a4a90c008950 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Efficient processing of deep neural networks: A tutorial and survey,
Reference 37
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 7428f8e2-0214-4c28-a1d5-9410f4845110 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Federated Learning via Over-the-Air Computation
Reference 39
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 137fd3f1-0464-401c-9b42-ae7ee90649ff · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence MIMO Over-the-Air Computation for High-Mobility Multi-Modal Sensing
Reference 40
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 58cb90e1-2183-4e1d-96c5-ae8651ee3eb1 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Wireless Federated Distillation for Distributed Edge Learning with Heterogeneous Data
Reference 41
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 238de2da-431d-4cd5-bbcf-23b2a3564b9f · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence A Graph Neural Network Approach for Scalable Wireless Power Control
Reference 42
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation eee0e13d-e5f5-4f02-a39f-d09bc7ac9178 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Dynamic Control of Functional Splits for Energy Harvesting Virtual Small Cells: a Distributed Reinforcement Learning Approach
Reference 43
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 642ad62a-dc60-435e-bb98-fe19b898f12a · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Wireless Data Acquisition for Edge Learning: Data-Importance Aware Retransmission
Reference 44
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 3e14a0d7-c20c-4a13-8953-18ae67f0f3ce · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Data-intensive ap- plication deployment at edge: A deep reinforcement learning approach,
Reference 45
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 467ac754-3543-4f5b-80b6-a6231c49a578 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Deep reinforcement learning: A brief survey,
Reference 46
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 68f11891-857c-4c93-96b2-42949e8f559e · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Online deep rein- forcement learning for computation offloading in blockchain-empowered mobile edge computing,
Reference 47
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 011c6991-4e38-4f58-a7c9-66efa75b065b · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Spatiotemporal edge service placement: A bandit learning approach,
Reference 48
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 7ff2eb65-56da-4f5f-b7d6-e4318bf5fd35 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Deep Reinforcement Learning for Online Computation Offloading in Wireless Powered Mobile-Edge Computing Networks
Reference 49
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation b6536a2d-7025-4703-b90d-3d31540b4b50 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Multi-user Resource Control with Deep Reinforcement Learning in IoT Edge Computing
Reference 50
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation feb7590f-f568-48ae-ac22-5081c18655b4 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Vehicular Edge Computing via Deep Reinforcement Learning
Reference 51
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 1d5ae64b-904d-4ce1-8511-97717930b606 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Optimized computation offloading performance in virtual edge computing systems via deep reinforcement learning,
Reference 52
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 14df7fa9-498b-400b-a66e-324f99bb491a · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Federated Learning: Strategies for Improving Communication Efficiency
Reference 53
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation b894c175-1ceb-4b82-8338-74f5375d7c74 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Memory-Driven Mixed Low Precision Quantization For Enabling Deep Network Inference On Microcontrollers
Reference 55
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 981746bf-0b59-43b9-9258-03408996a3a1 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Cache-Aided NOMA Mobile Edge Computing: A Reinforcement Learning Approach
Reference 56
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 0a0575c7-0c60-4cf0-940d-4997bc7f2e73 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Run-Time Efficient RNN Compression for Inference on Edge Devices
Reference 57
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 9f81cd68-6299-41f0-ba82-e0d963718e51 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Diving deeper into mentee networks
Reference 58
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 90653d8c-e661-47b7-a97c-1bec4eea842a · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Efficient Hybrid Network Architectures for Extremely Quantized Neural Networks Enabling Intelligence at the Edge
Reference 59
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 99719565-eb24-44d3-8daf-8400737c0ef0 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Constructing Energy-efficient Mixed-precision Neural Networks through Principal Component Analysis for Edge Intelligence
Reference 60
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 8b6143f2-3916-4949-876a-93ce07ec4021 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Strategies for re- training a pruned neural network in an edge computing paradigm,
Reference 61
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation df1f71ff-3ea0-4e2f-aada-d39660d61567 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Toward Runtime-Throttleable Neural Networks
Reference 62
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 3e4eb8f5-de67-4b25-b2b7-fce0cd4b509b · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Gossip training for deep learning
Reference 63
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 6245b5be-4bd8-4c91-8e35-398ae4b16925 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence GossipGraD: Scalable Deep Learning using Gossip Communication based Asynchronous Gradient Descent
Reference 64
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation ba9521c1-b55d-40c6-a25c-2a6e4eabe5ad · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Protonn: Compressed and accurate knn for resource-scarce devices,
Reference 66
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation bc0ebf2c-4936-44f0-a08d-503ccc3d8a54 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence SCAN: A Scalable Neural Networks Framework Towards Compact and Efficient Models
Reference 67
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 5d11ad02-f0ca-4958-862b-ea18d9116637 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Stochastic neighbor compression,
Reference 68
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 2bcaf2f7-8500-4d90-a94b-240f6867d918 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Blockchained On-Device Federated Learning
Reference 71
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 71a78c4a-f7e4-4246-8c36-1ad71f72ebc2 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Auto-tuning Neural Network Quantization Framework for Collaborative Inference Between the Cloud and Edge
Reference 72
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation 54eeff24-e0ce-4a7b-a0ed-e4f16a0914b4 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Practical Secure Aggregation for Federated Learning on User-Held Data
Reference 2016
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 39a66afc-4f3b-491d-8136-caba918aa0c4 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Available: https://doi.org/10.1109/TASE.2015.2438020
Reference 2017
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
Observation cc47f48b-b2e6-444e-b9c8-c9cf3ec3e7fe · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Broadband Analog Aggregation for Low-Latency Federated Edge Learning (Extended Version)
Reference 2018
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 2ddddf2f-ad8c-4265-be9c-588e6364f928 · outbound
Edge Intelligence: The Confluence of Edge Computing and Artificial Intelligence Available: https://www.ericsson.com/en/mobility-report/ reports/june-2019/iot-connections-outlook
Reference 2019
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-15T06:32:42.880941+00:00.
No inbound Pith citation observations are available.