Pyalchenkov, V. A., G. A. Kulyabin, V. V. Dolgushin, and D. V. Pyalchenkov. 2019. “Analytical and Experimental Study of the Deformation of Roller Cone Bit Parts”. Amazonia Investiga 8 (21):23-32. https://amazoniainvestiga.info/index.php/amazonia/article/view/44.