Two-point Padé approximants that interpolate weak- and strong-coupling expansions produce accurate global approximations to the two-point correlation function in lattice φ⁴ theory over wide coupling ranges.
Schollw¨ ock, The density-matrix renormalization group, Reviews of modern physics77, 259 (2005)
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Strong-coupling expansion and two-point Pad\'e approximation for lattice $\phi^4$ field theory
Two-point Padé approximants that interpolate weak- and strong-coupling expansions produce accurate global approximations to the two-point correlation function in lattice φ⁴ theory over wide coupling ranges.