Lopyrev, V. A.; Kurochkin, V. N.; Titova, I. A.; Voronkov, M. G.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1989 , vol. 38, # 10 p. 2174 - 2175
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1989 , # 10 p. 2363