Morozov, I., V. Morozov, E. Olkhovsky, and V. Sinohub. “The Efficiency of the Drills at the Expense of Improvement of Parameters of Working”. Scientific Journal «Engineering of Nature Management» , no. 2(2), Jan. 2020, pp. 100-3, http://enm.khntusg.com.ua/index.php/enm/article/view/236.