1. V. V. Bakaev, T. G. Bakaeva, and N. N. Domanskii,Mol. Biol., No. 15, 824–834 (1981).
2. N. Ya. Vilenkin,Combinatorial Analysis [in Russian], Moscow (1975).
3. P. Zengbush,Molecular and Cellular Biology [in Russian], Vol. 3, Moscow (1982).
4. G. Korn and T. Korn,Mathematics Reference Book [in Russian], Moscow (1977).
5. T. A. Leont'eva and L. N. Belov,Tsitologiya,20, No. 3, 339–341 (1978).