UBONG, A. Iboh; SAMUEL, T. Ebong; UBONG, W.Robert; SANDY, Christopher F.; EFIANG, John A. Determination of the Density and Viscosity of Engine Oil with Grade 20w-50 in Nigeria. International Journal of Natural and Practical Sciences (IJNPS), [S. l.], v. 5, n. 1, p. 1–11, 2023. Disponível em: http://icidr.org.ng/index.php/Ijnps/article/view/529. Acesso em: 19 sep. 2024.