1. G. M. Nazin and G. B. Manelis,Usp. Khim., 1994,4, 329 [Russ. Chem. Rev., 1994 (Engl. Trans].)].
2. G. M. Nazin and G. B. Manelis,Izv. Akad. Nauk SSSR, Ser. Khim., 1972, 81] [Bull. Acad. Sci. USSR, Div. Chem. Sci., 1972,21, 768 (Engl. Transl.)].
3. C. Koulson,Valentnost [Valence], Mir, Moscow, 1965, 426 pp. (Russ. Transl.).
4. V. I. Minkin, B. Ya. Simkin, and R. M. Minyaev,Kvantovaya khimiya organicheskikh soedinenii [Quantum Chemistry of Organic Compounds], Khimiya, Moscow, 1986, 246 pp. (in Russian).
5. L. V. Vilkov, V. S. Mastryukov, and N. I. Sadova,Opredelenie geometricheskogo stroeniya svobodnykh molekul [Determination of Geometric Structure of Free Molecules], Khimiya, Leningrad, 1978, 224 pp. (in Russian).