Hermann, Klaus; Simchen, Gerhard
Liebigs Annalen der Chemie, 1981 , # 2 p. 333 - 341

Baram, S. G.; Shkurko, O. P.; Mamaev, V. P.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1991 , vol. 40, # 3.2 p. 601 - 605
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1991 , # 3 p. 686 - 690

Hermann, Klaus; Simchen, Gerhard
Liebigs Annalen der Chemie, 1981 , # 2 p. 333 - 341