dos Santos, Lilian, Victor dos Santos, and Ana Emília Guedes. 2019. “ANALYSIS OF FRICTION AND WEAR COEFFICIENT IN BEARING STEEL WITH IRON OXIDE NANOPARTICLE LUBRICANT”. ITEGAM-JETIA 5 (18), 89-93. http://br940.teste.website/~itegamjetia/journal/index.php/jetia/article/view/416.