1. V. A. Tafeenko, L. A. Aslanov, and A. N. Kost, Dokl. Akad. Nauk SSSR,252, No. 1, 106 (1980).
2. V. A. Tafeenko and L. A. Aslanov, Zh. Strukt. Khim.,21, No. 6, 69 (1980).
3. V. A. Tafeenko and L. A. Aslanov, Zh. Strukt. Khim.,21, No. 6, 69 (1980).
4. D. J. Pointer and J. B. Wilford, J. Chem. Soc., Perkin Trans., II, No. 15, 2259 (1972).
5. P. G. Owston and J. M. Rowe, Acta Crystallogr.,15, No. 3, 231 (1962).