1. G. D. Fong and R. L. Kuczkowski, Inorg. Chem.,20, 2342 (1981).
2. V. A. Naumov, V. Yu. Nesterov, and I. A. Aleksandrova, Zh. Strukt. Khim.,25, 137 (1984).
3. S. Kh. Nurtdinov, S. V. Khairullina, V. K. Khairullin, et al., Zh. Obshch. Khim.,53, 785 (1983).
4. M. Traetteberg and E. B. Frantsen, J. Mol. Struct.,26, 57 (1975).
5. R. R. Shagidullin and A. V. Chernova, Izv. Akad. Nauk SSSR, Ser. Khim., No. 1, 183 (1971).