1. V. A. Bazakutsa, N. I. Gnidash, V. B. Lazarev, E. I. Rogacheva, A. V. Salov, L. N. Sukhorukova, M. P. Vasil'eva, and S. I. Berul', Zh. Neorg. Khim.,18, 3234 (1973).
2. N. A. Graf and H. Schäfer, Z. Anorg. Allgem. Chem.,414, 211 (1975).
3. A. S. Kanishcheva, K. K. Palkina, V. G. Kuznetsov, V. B. Lazarev, and T. G. Tarasova, Izv. Akad. Nauk SSSR, Ser. Neorg. Mater.,12, 537 (1976).
4. A. S. Kanischeva, V. G. Kuznetsov, K. K. Palkina, V. B. Lazarev, and T. G. Tarasova, Summary of Papers of the Eleventh All-Union Conference on the Application of X-Ray Beams for the Investigation of Materials, Zvenigorod, April 24?26, 1976 [in Russian], Nauka, Moscow (1976), p. 39.
5. S. I. Berul', V. B. Lazarev, and A. V. Salov, Zh. Neorg. Khim.,16, 3363 (1971).