1. E. Lombardi and L. Jansen, Phys. Rev.,136, A1011 (1964);167, 822 (1968).
2. V. Heine, M. Cohen, and D. Weir, Pseudopotential Theory [Russian translation], Moscow (1973).
3. T. Kihara, Adv. Chem. Phys.,1, 267 (1958).
4. L. Jansen, Phys. Rev.,125, 1798 (1962);135, A1292 (1964).
5. N. N. Bogolyubov, Selected Works [in Russian], Vol. 2 (1970).