1. B. Velický, S. Kirkpatrick, H. Ehrenreich
    Single-site approximation in the electronic theory of simple binary alloys
    Phys. Rev. 175 (1968) 747
  2. B. Velický, S. Kirkpatrick, H. Ehrenreich
    Electronic structure of binary alloys: Tight binding approximation
    Bull. Amer. Phys. Soc. 13 (1968) 643