1. N. N. Bulgakov, Yu. A. Borisov, V. V. Popovskii: Kinet. Katal.,14, 468 (1973).
2. G. B. Bokii: Introduction into Crystal Chemistry. MGU, Moskva 1954.
3. V. N. Kondratiev: Dissociation Energy of Chemical Bonds. Ionization Potentials and Electron Affinity. Nauka, Moskva 1974.
4. D. V. Korolkov: Zh. Strukt. Khim.,15, 1012 (1974).
5. M. Moskovits, G. A. Ozin: J. Mol. Struct.,32, 71 (1976).