Popov, A. I.; Kiselev, Yu. M.; Sukhoverkhov, V. F.; Chumaevskii, N. A.
Russian Journal of Inorganic Chemistry (Translation of Zhurnal Neorganicheskoi Khimii), 1988 , vol. 33, p. 789 - 791
Zhurnal Neorganicheskoi Khimii, 1988 , vol. 33, p. 1395 - 1397