1. Asimov, I., The Near East: 10,000 Years of History, Boston: Houghton Mifflin, 1968.
2. Lakhtin, Yu.M. and Leont’eva, Metallovedenie (Metal Science), Moscow: Mashinostroenie, 1990.
3. Kunst, H., Haase, B., Malloy, J.C., Wittel, K., et al., Metals, surface treatment, in Ullmann’s Encyclopedia of Industrial Chemistry, Weinheim: Wiley, 2012, p. 44. https://onlinelibrary.wiley.com/doi/pdf/10.1002/14356 007.a16_403.pub2.
4. Gurevich, Yu.G. and Lyapina, V.A., RF Patent 2036243, 1995.
5. Shipko, A.A., Rudenko, S.P., Val’ko, A.L., and Chichin, A.N., Lit’e Metall., 2016, vol. 83, no. 2, pp. 104–109.