Dvornikova, K. V.; Platonov, V. E.; Yakobson, G. G.
Russian Chemical Bulletin, 1993 , vol. 42, # 10 p. 1690 - 1693
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1993 , # 10 p. 1767 - 1770