1. V. Drchal, V. Janiš, J. Kudrnovský
    Multiband Hubbard Hamiltonians with exchange: single-channel approximations
    Physica B: Condensed Matter 312-313 (2002) 519-521.
  2. V. Janiš
    Electron-hole resonant states in the $d=\infty$ Hubbard model
    Physica B: Condensed Matter 312-313 (2002) 522-524.