Samotugin, S.S., Haharin, V.O., Mazur, V.O. and Nesterov, O.Y. 2017. Metallographic examination of hardened layers after surface treatments by highly concentrated plasma jet. Reporter of the Priazovskyi State Technical University. Section: Technical sciences. 34 (Jul. 2017), 98–105. DOI:https://doi.org/10.31498/2225-6733.34.2017.105666.