1. N. N. Chudinova, E. V. Murashova, and B. S. Zakharova, Zh. Neorg. Khim. 43(6), 885 (1998).
2. E. V. Murashova and N. N. Chudinova, Neorg. Mater. 36(12), 1507 (2000); 36 (12), 1512 (2000).
3. M. Bagieu-Beucher, Acta Crystallogr., Sect. B: Struct. Crystallogr. Cryst. Chem. B34, 1443 (1978).
4. J. C. Guintel and I. Tordjman, Acta Crystallogr., Sect. B: Struct. Crystallogr. Cryst. Chem. B32, 2960 (1976).
5. G. M. Sheldrick, SHELXS97: Program for the Solution of Crystal Structures (Univ. of Göttingen, Göttingen, 1997).