1. O. Bratteli and D. W. Robinson,Operator Algebras and Quantum Statistical Mechanics II (Springer, New York, 1979).
2. J. Feldman and E. Trubowitz, Perturbation theory for many-fermion systems,Helv. Phys. Acta 63:156 (1990).
3. J. Feldman and E. Trubowitz, The flow of an electron-phonon system to the superconducting state,Helv. Phys. Acta 64:213 (1991).
4. E. H. Lieb, The Hubbard model: Some rigorous results and open problems, inAdvances in Dynamical Systems and Quantum Physics (World Scientific, Singapore, 1995).
5. J. Feldman, J. Magnen, V. Rivasseau, and E. Trubowitz, An infinite volume expansion for many fermion Green's functions,Helv. Phys. Acta 65:679 (1992).