Bakytzhan, S., A. Kaukarov, M. Kuanyshev, A. Murzagaliev, K. Narikov, and B. Shakeshev. “The Improvement of Friction Bearing Manufacturing Technology by Using Copper Alloy”. Advanced Technologies and Materials, vol. 40, no. 2, Dec. 2015, pp. 13-22, https://jged.uns.ac.rs/index.php/atm/article/view/JTP.2015.40.2.2.