Analysis of metal concentration, performance and noise emissions of the CI engine. Natural and Applied Sciences International Journal (NASIJ), Peshawar, Pakistan, v. 4, n. 2, p. 94–107, 2023. DOI: 10.47264/idea.nasij/4.2.6. Disponível em: https://ideapublishers.org/index.php/nasij/article/view/1047. Acesso em: 24 may. 2026.