1. RF Patent no. 2019503, Byull. Izobret., 1994, no 17.
2. RF Patent no. 2026813, Byull. Izobret., 1995, no. 2; RF Patent no. 2073642, Byull. Izobret., 1997, no. 5; RF Patent no. 2085486, Byull. Izobret., 1997, vol. 21; RF Patent no. 2257343, Byull. Izobret., 2005, no 21.
3. Polyakov, N.S. and Petukhova, G.A., Ross. Khim. Zh., 1995, vol. 39, p. 7.
4. Gur’yanov, V.V., Dubinin, M.M., and Misin, M.S., Zh. Fiz. Khim., 1975, vol. 49, p. 2370.
5. Gur’yanov, V.V., Petukhova, G.A., and Polyakov, N.S., Izv. Akad. Nauk, Ser. Khim., 2001, p. 933.