1. Tret’yakov, Yu.D., Os’kina, T.E., and Putlyaev, V.I., Zh. Neorg. Khim., 1990, vol. 35, no. 7, pp. 1635–1640.
2. Vanetsev, A.S. and Tret’yakov, Yu.D., Usp. Khim., 2007, vol. 76, no. 5, pp. 435–453.
3. Sahu, R.K., Rao, M.L., and Manoharan, S.S., Mater. Lett., 2001, vol. 48, pp. 176–183.
4. Vanetsev, A.S., Ivanov, V.K., and Tret’yakov, Yu.D., Dokl. Chem., 2003, vol. 387, nos. 4–6, pp. 332–334 [Dokl. Akad. Nauk, 2003, vol. 387, no. 6, pp. 640–642].
5. Kwong, W.L. and Yau, J.K.F., Supercond. Sci. Technol., 2003, vol. 16, pp. 512–517.