Levchenko, Sergey, and Volodymyr Ledovskykh. “SPARK MACHINING FOR STEEL SURFACES TO IMPROVE PAINT COATINGS QUALITY”. Proceedings of National Aviation University 65, no. 4 (February 1, 2016): 72–76. Accessed April 16, 2024. https://jrnl.nau.edu.ua/index.php/visnik/article/view/9858.