Serebryakov, E. P.; Gamalevich, G. D.; Shekhtman, R. I. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1985 , vol. 34, p. 1737 - 1739 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1985 , # 8 p. 1887 - 1890