Vasil'eva, T. P.; Bystrova, V. M.; Kil'disheva, O. V.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1988 , vol. 37, p. 1448 - 1455
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1988 , # 7 p. 1633 - 1640