Alfer'ev, I. S.; Bobkov, S. Yu.; Kotlyarevskii, I. L. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1987 , vol. 36, # 3 p. 571 - 576 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1987 , # 3 p. 624 - 630