Antokhina,L.A.; Alimov,P.I. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1971 , vol. 20, # 4 p. 723 - 726 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1971 , vol. 20, # 4 p. 806 - 810