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2. A. I. Gribanov, Methods of Calculating Visibility Under Directed Illumination [in Russian], Gosenergoizdat, Moscow, 1955.
3. L. M. Romanova, Optika i spektroskopiya, 13, 429, 1962; 13, 819, 1962.
4. L. M. Romanova, Izv. AN SSSR, ser. geofiz., no. 8, 1108, 1962.
5. T. A. Germogenova, DAN SSSR, 113, 297, 1957.