Ramos , E., T. Pinto Junior, R. Silva, G. Uchoa, V. Rodrigues, y G. Rodrigues. Comparative Study of Synthetic and Semi-Synthetic Lubricating Oils and Their Lubricating Capacities. ITEGAM-JETIA, Vol. 2, n.º 8, Dec. 2017, https://itegam-jetia.org/journal/index.php/jetia/article/view/147.