1. A. V. Shubnikov, Selected Works on Crystallography (Nauka, Moscow, 1975) [in Russian], p. 44.
2. P. Engel, Geometric Crystallography (D. Reidel, Dordrecht, 1986).
3. M. O’Keeffe and V. G. Hyde, Prot. Trans. Roy. Soc. Math. Phys. Sci. 295, 553 (1980).
4. A. F. Wells, Structural Inorganic Chemistry (Clarendon, Oxford, 1975).
5. G. D. Ilyushin and L. N. Dem’yanets, Model of Matrix Assembly of Crystal Structures. Crystallization Physics (Fizmatlit, Moscow, 2002) [in Russian], p. 82.