Teplyakov, M. M.; Khotina, I. A.; Gelashvili, Ts. L.; Korshak, V. V. Doklady Chemistry, 1983 , vol. 271, p. 252 - 254 Dokl. Akad. Nauk SSSR Ser. Khim., 1983 , vol. 271, # 4 p. 874 - 877