Proves there are infinitely many 0-concordance classes of 2-knots in S^4 using Rochlin's invariant and Heegaard-Floer homology invariants.
Scott Carter, Masahico Saito, and Shin Satoh, Ribbon concordance of surface-knots via quandle cocycle invariants , J
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0-Concordance of 2-knots
Proves there are infinitely many 0-concordance classes of 2-knots in S^4 using Rochlin's invariant and Heegaard-Floer homology invariants.