Kayushina, E. N.; Levin, D. Z.; Mortikov, E. S.; Promonenkov, V. K. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1986 , vol. 35, p. 1474 - 1477 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1986 , # 7 p. 1625 - 1628