Churkina, T. D.; Petrova, R. G.; Kandror, I. I.; Freidlina, R. Kh.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1984 , vol. 33, p. 1946 - 1949
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1984 , # 9 p. 2130 - 2134

Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), , vol. 31, p. 1873 - 1876
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, , # 9 p. 2121 - 2125

Behringer; Meier
Justus Liebigs Annalen der Chemie, 1957 , vol. 607, p. 67,76