Godovikov, N. N.; Vikhreva, L. A.; Babasheva, K. K.; Darisheva, A. M.; Matrosov, E. I.; Kabachnik, M. I. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1983 , vol. 32, p. 1510 - 1512 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1983 , # 7 p. 1662 - 1664