- Comment on Interacting-electron model exactly solvable in any dimensionPhys. Rev. Lett. 69 (1992) 2443
- Coupling of quantum degrees of freedom in strongly interacting disordered electron systemsPhys. Rev. B 46 (1992) 15712
- Comprehensive mean-field theory for the Hubbard modelJ. Math. Phys. 6 (1992) 5