Bumagin, N. A.; Sukhomlinova, L. I.; Tolstaya, T. P.; Vanchikov, A. N.; Beletskaya, I. P.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1990 , vol. 39, # 11 p. 2419
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1990 , # 11 p. 2665 - 2666

Gade, Thomas; Streek, Michael; Voss, Juergen
Chemische Berichte, 1992 , vol. 125, # 1 p. 127 - 142

Boyland,E. et al.
Journal of the Chemical Society, 1962 , p. 606 - 611