Feldman, Joel; Magnen, Jacques; Rivasseau, Vincent; Trubowitz, Eugene Ward identities and a perturbative analysis of a \(U(1)\) Goldstone boson in a many fermion system. (English) Zbl 0829.46057 Helv. Phys. Acta 66, No. 5, 498-550 (1993). MSC: 46N50 81Q15 82B10 PDFBibTeX XMLCite \textit{J. Feldman} et al., Helv. Phys. Acta 66, No. 5, 498--550 (1993; Zbl 0829.46057)
Feldman, Joel; Magnen, Jacques; Rivasseau, Vincent; Trubowitz, Eugene An infinite volume expansion for many fermion Green’s functions. (English) Zbl 0921.35140 Helv. Phys. Acta 65, No. 5, 679-721 (1992). MSC: 35Q40 81T15 81V70 81T18 PDFBibTeX XMLCite \textit{J. Feldman} et al., Helv. Phys. Acta 65, No. 5, 679--721 (1992; Zbl 0921.35140)