Volynskii,N.P.; Shcherbakova,L.P. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1979 , vol. 28, p. 1009 - 1013 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1979 , vol. 28, p. 1080 - 1085