Hao, Nguen Kong; Mavrov, M. V.; Serebryakov, E. P. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1987 , vol. 36, # 4 p. 830 - 833 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1987 , # 4 p. 903 - 906