Tleukenov, Y., S. Plotnikov, A. Pogrebnjak, N. Erdybaeva, and A. Manapbayeva. “Microstructure, Elemental and Phase Composition and Physical-Mechanical Properties of Nanocomposite (Ti-Zr-Hf-V-Nb-Ta)N Coatings before and After Implantation of High Doses of Nitrogen Ions”. Recent Contributions to Physics, vol. 2017, no. 1, Mar. 2018, pp. 62-71, https://bph.kaznu.kz/index.php/zhuzhu/article/view/514.