1. N. F. Stepanov, M. E. Erlykina, and G. G. Filippov, Methods of Linear Algebra in Physical Chemistry (Mosk. Gos. Univ., Moscow, 1976) [in Russian].
2. R. Daudel and O. Chalvet, Localization and Delocalization in Quantum Chemistry (Kluwer, Dordrecht, 1975; Mir, Moscow, 1978), p. 179.
3. M. I. Stankevich, I. V. Stankevich, and N. S. Zefirov, Russ. Chem. Rev. 57, 191 (1988).
4. N. I. Zhokhova, I. I. Baskin, V. A. Palyulin, et al., Russ. J. Appl. Chem. 76, 1914 (2003).
5. D. Yu. Nilov, D. V. Sokolov, V. M. Smolyakov, and M. N. Polyakov, Russ. J. Phys. Chem. A 77, 685 (2003).