1. On some possible consequences of exciton-phonon interaction
2. Theory of Excitons, Izd. Nauka, Moskwa 1968 (p. 127) (in Russian).
3. Methods of Quantum Theory in Magnetism, Izd. Nauka, Moskwa 1965 (p. 111) (in Russian).
4. and : Statistical Physics, Izd. Nauka, Moskwa 1964 (p. 234) (in Russian).