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2. V. A. Koptsik, in Problems of Modern Crystallography: Collection of Articles in Memory of Academician A.V. Shubnikov (Nauka, Moscow, 1975) [in Russian], p. 42.
3. A. V. Shubnikov, Selected Works on Crystallography (Nauka, Moscow, 1975) [in Russian].
4. I. I. Shafranovskii, Essays on Mineralogical Crystallography (Nedra, Leningrad, 1974) [in Russian].
5. I. I. Shafranovskii, Symmetry in Nature (Nedra, Leningrad, 1968) [in Russian].