1. S. Cradock and R. A. Whiteford, J. Chem. Soc. Faraday Trans. II,68, No. 2, 281 (1972).
2. H. Bock, P. Mollere, G. Becker, and G. Fritz, J. Organometal. Chem.,61, 113 (1973).
3. W. Ensslin, H. H. Schmidtke, and T. H. Kuhn, Inorg. Chim. Acta,24, 159 (1977).
4. A. I. Ermakov, É. A. Kirichenko, N. I. Pimkin, and N. A. Makrushin, Summaries of Papers Presented at the Fifth All-Union Conference on the Use of Computers in Molecular Spectroscopy and Chemical Studies [in Russian], Rotaprint of the Intitute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk (1980), p. 123.
5. É. A. Kirichenko and A. I. Ermakov, Zh. Fiz. Khim.,50, No. 9, 2381 (1976).