Яким, Р. С. “BASIC PRINCIPLES OF CONSTRUCTION IMPROVEMENT OF THE INSERTED HARD-FENCING ALLOYED EQUIPMENT OF THREE-CONE ROCK BITS”. Oil and Gas Power Engineering, no. 1(14) (March 30, 2011): 22–28. Accessed May 4, 2024. https://nge.nung.edu.ua/index.php/nge/article/view/132.