J. Arguelles-Ojeda, A. Márquez-Herrera, A. Saldaña-Robles, A. Saldaña-Robles, M. Corona-Rivera, and J. Moreno-Palmerin, Hardness optimization of boride diffusion layer on ASTM F-75 alloy using response surface methodology, Rev. Mex. Fís. 63, (2017).