Mirskova, A. N.; Seredkina, S. G.; Shagun, V. A.; Kalikhman, I. D.; Modonov, V. B.; et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1988 , vol. 37, p. 514 - 518
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1988 , # 3 p. 612 - 616