Shevchenko, Yu. N.; Golub. N. B.
Russian Journal of Inorganic Chemistry (Translation of Zhurnal Neorganicheskoi Khimii), 1979 , vol. 24, p. 1843 - 1845
Zhurnal Neorganicheskoi Khimii, 1979 , vol. 24, p. 3309 - 3313