Dolgii, I. E.; Okonnishnikova, G. P.; Ignatenko, A. V. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1986 , vol. 35, # 4 p. 864 - 867 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1986 , # 4 p. 947 - 950