1. O. Piringer, A. Farcas, and U. Luca, Proceedings of the IX International Conference on Coordination Chemistry, St. Moritz (1966), p. 202.
2. T. Funabiki, Sh. Kasaoka, M. Matsumota, and K. Tarama, J. Chem. Soc. Dalton Trans., 2043 (1974).
3. K. Kh. Freidlin, E. F. Litvin, and K. G. Karimov, Izv. Akad. Nauk SSSR. Ser. Khim., 321 (1974).
4. K. Bujadoux, R. Clement, J. Jozefonvich, and J. Neel, Eur. Polym. J.,9, 189 (1973).
5. L. Kh. Freidlin, L. I. Gvinter, and L. N. Suvorova, Izv. Akad. Nauk SSSR, Ser. Khim., 1342 (1975).