1. N. K. Nadirov, A. V. Kotova, V. F. Kam’anov, V. I. Titov, G. N. Aleshin, V. P. Solodukhin, S. F. Bakirova, G. G. Glukhov, N. M. Koryabina, Metals in oils, Nauka Kaz. SSR, Alma-Ata, 1984.
2. V. P. Solodukhin, G. M. Kabirova, V. V. Smetannikov, Proc. Intern. Conf. on Oil Shale and Shale Oil, Chemical Industry Press, Beijing, 1988, p. 136.
3. V. P. Solodukhin, Abstracts to International Conference on Petroleum Chemistry, Tomsk, 1991, p. 81.
4. K. R. Shah, R. H. Filby, W. A. Haller, J. Radioanal. Chem., 5 (1970) 413.
5. K. R. Shah, R. H. Filby, W. A. Haller, J. Radioanal. Chem., 6 (1970) 185, 413.