1. K. S. Shifrin: ‘Optical Investigations of Cloud Particles’, in Investigations of Clouds, Precipitation and Thunderstorm Electricity (Gidrometizdat, Moscow, 1957), in Russian.
2. E. M. Feigelson: Radiation Processes in Stratus (Nauka, Moscow, 1964), in Russian.
3. O. A. Volkovitsky et al.: High-Power Beam Propagation in Clouds ( Gidrometizdat, Leningrad, 1982 ), in Russian.
4. V. E. Zuev et al.: Nonlinear Optical Effects in Aerosols ( Nauka, Novosibirsk, 1980 ), in Russian.
5. V. P. Bisyarin et al.: Radiotekh. 11, 5–148 (1976), in Russian.