Kaleicheva, Julieta, Valentin Mishev, and Manahil Tongov. “INVESTIGATION ON TRIBOLOGICAL BEHAVIOR OF DUCTILE CAST IRONS WITH NANOSIZED PARTICLES”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June 20, 2019): 84–87. Accessed May 5, 2024. https://journals.ru.lv/index.php/ETR/article/view/4181.