Pyalchenkov, Vladimir, Dmitry Pyalchenkov, and Lybov Nikitina. “Influence of Test Modes and Accuracy of Manufacturing a Roller Cone Bit on Loading of Its Elements”. Amazonia Investiga 8, no. 23 (October 11, 2019): 613-620. Accessed April 28, 2024. https://amazoniainvestiga.info/index.php/amazonia/article/view/909.