1. J. Ritz, H. Fuchs, H. Kieczka, W. C. Moran, Caprolactam, Wiley-VCH Verlag, Weinheim, 2005.
2. Zhi-Zhong Jing, Hu-Ping Li, Hua-Shan Zhang, Microchem. J., 2001, 69, 213.
3. S. Ya. Karaslva, E. L. Krasnyh, S. V. Levanova, G. G. Petrov, S. Ya. Sadivsky, Mendeleev Chem. J. (Engl. Transl.), 2006, 50.
4. Hexin Hu, Sun Bin, Wang Enquan, Petroleum Processing and Petrochemicals, 2011, 42, no 6, 84.
5. E. N. Zhdanuk, E. T. Krut’ko, N. R. Prokopchuk, Proceedings of the Belorussian State Technological University, 2011, 4, 21.