1. Shapoval, V. I.; Makogon, V. F.; Perchik, O. F. (Zh. Prikl. Khim. 48 [1975] 2471/4);
2. Shapoval, V. I.; Makogon, V. F.; Perchik, O. F. J. (Appl. Chem. [USSR] 48 [1975] 2553/6).
3. Kust, R. N. (Inorg. Chem. 6 [1967] 2239/43).
4. Shapoval, V. I.; Tsiklauri, O. G.; Gasviani, N. A. (Soobshch. Akad. Nauk Gruz.SSR 89 [1978] 101/4); (C. A. 88 [1978] No. 160/705).
5. Perepelitsa, A. P. (Izv. Akad. Nauk SSSR Neorgan. Materialy 16 [1980] 1225/8);