Usherenko, Yulia, Sergei Usherenko, Vladimir Dashkevich, and Javad Yazdani. 2017. “USING DYNAMIC PRE-ACTIVATION OF STEEL SURFACES FOR NITRIDING INTENSIFICATION”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June): 321-24. https://doi.org/10.17770/etr2017vol3.2616.