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    Comment on Interacting-electron model exactly solvable in any dimension
    Phys. Rev. Lett. 69 (1992) 2443
  2. V. Janiš, D. Vollhardt
    Coupling of quantum degrees of freedom in strongly interacting disordered electron systems
    Phys. Rev. B 46 (1992) 15712
  3. V. Janiš, D. Vollhardt
    Comprehensive mean-field theory for the Hubbard model
    J. Math. Phys. 6 (1992) 5