L. Geraldo Leite, Ítalo de Abreu Gonçalves, C. H. de Oliveira, T. G. de Brito, S. M. Neves, and E. J. de Paiva, “ANALYSIS OF SURFACE ROUGHNESS MILLED OF STEEL AISI 1045 USING X-BAR AND R CONTROL CHART ”, Int. J. Eng. Tech. Mgmt. Res., vol. 5, no. 6, pp. 15–23, Jun. 2018.