Shcherbina, T. M.; Laretina, A. P.; Gilyarov, V. A.; Korkin, A. A.; Kabachnik, M. I. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1991 , vol. 40, # 1.2 p. 239 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1991 , # 1 p. 259