DYKHA, M.; HETMAN, M.; DYTYNIUK, V.; MAKOVKIN, O. Experimental and Analytical Study of Acid Number Variation in Engine Oils Under Operational Contamination. Problems of Tribology, [S. l.], v. 31, n. 1/119, p. 48–55, 2026. DOI: 10.31891/2079-1372-2026-119-1-48-55. Disponível em: https://tribology.khmnu.edu.ua/index.php/ProbTrib/article/view/1049. Acesso em: 17 mar. 2026.