MELNYK, V. M.; HNYP, M. M. Improving the environmental safety of the D21A1 diesel engine by ensuring its operation on the gas-diesel cycle using biogas fuel. Oil and Gas Power Engineering, [S. l.], n. 1(45), p. 211–222, 2026. DOI: 10.31471/1993-9868-2026-1(45)-211-222. Disponível em: https://nge.nung.edu.ua/index.php/nge/article/view/706. Acesso em: 30 may. 2026.