1. M. V. Mokhosoev and Zh. G. Bazarova,Complex Molybdenum and Tungsten Oxides with Group I–IV Elements [in Russian], Nauka, Moscow (1990).
2. J. M. Sheldrick,SHELX, Program System for Crystal Structure Determination, Cambridge University, Cambridge (1976).
3. V. K. Trunov, V. A. Efremov, and Yu. A. Velikodnii,Crystal Chemistry and Properties of Binary Molybdates and Tungstates [in Russian], Nauka, Leningrad (1986), p. 85.
4. R. F. Klevtsova, L. A. Glinskaya, and N. P. Pasechnyuk,Kristallografiya,22, No. 6, 1191–1195 (1977).
5. P. V. Klevtsov, E. S. Zolotova, L. A. Glinskaya, and R. F. Klevtsova,Zh. Neorg. Khim.,25, No. 7, 1844–1850 (1980).