1. J. M. Ziman, Calculation of Bloch Functions [Russian translation], Mir, Moscow (1973).
2. W. A. Harrison, Pseudopotentials in the Theory of Metals, W. A. Benjamin (1966).
3. W. A. Harrison, Phys. Rev.,181, 1036 (1969).
4. J. A. Moriarty, Phys. Rev.,B5, 2066 (1972).
5. V. Kheine, M. Kohn, and D. Weir, Pseudopotential Theory [Russian translation], Mir, Moscow (1973).