1. S. N. Khadzhiev, Pet. Chem. 51, 1 (2011).
2. S. N. Khadzhiev and Kh. M. Kadiev, Chem. J., September, 34 (2009).
3. S. N. Khadzhiev, Kh. M. Kadiev, V. Kh. Mezhidov, et al. US Patent No. 7 585 406 (2009).
4. G. A. Berg and S. G. Khabibullin, Catalytic Hydrofining of Petroleum Residues (Khimiya, Leningrad, 1986) [in Russian].
5. M. Kh. Kadieva, S. N. Khadzhiev, Kh. M. Kadiev, and T. V. Yakovenko, Pet. Chem. 51, 426 (2011).