Kasatkin, A. N.; Kulak, A. N.; Tolstikov, G. A.; Lomakina, S. I. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1988 , vol. 37, p. 1939 - 1945 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1988 , # 9 p. 2159 - 2166