1. V. A. Fomin, A. F. Vil'danov, A. M. Mazgarov et al., Nefteper. Neftekhim., No. 12, 14–15 (1987).
2. A. G. Akhmadullina, B. V. Kizhaev, G. M. Nurgalieva et al., Ibid, No. 2, 39–41 (1994).
3. Kh. S. Merpeisov, I. V. Isoichenko, and A. V. Konovalov, Neft' Gaz, No. 3, 50–52 (2007)
4. A. G. Akhmadullina, R. M. Akhmadullin, V. A. Smirnov et al., Nefteper. Neftekhim., No. 3, 15–17 (2005).
5. A. Kh. Sharipov, Khim. Tekhnol. Topliv Masel, No. 4, 9–13 (1998).