1. Chernorukov, N.G., Nipruk, O.V., Suleimanov, E.V., and Pykhova, Yu.P., Radiokhim., 2009, vol. 51, no. 5, p. 388.
2. Chernorukov, N.G., Nipruk, O.V., Pykhova, Yu.P., and Godovanova, N.S., Radiokhim., 2011, vol. 53, no. 4, p. 307.
3. Pekarek, V., Vesely, V., and Ullrich, J., Bull. Soc. Chim., 1968, no. 8, p. 1844.
4. Vochten, R., Piret, P., and Goeminne, A., Bull. Mineral., 1981, vol. 104, no. 3, p. 457.
5. Chernorukov, N.G. and Karyakin, N.V., Usp. Khim., 1995, vol. 64, no.10, p. 975.