Béjar-Gómez, L., A. Medina-Flores, M. Pérez-López, and C. Maldonado-Zepeda. “Characterization for HRTEM of AISI 4140 Steel Nitrided by Postdischarge Micro-Wave”. Revista De Metalurgia, vol. 41, no. Extra, Dec. 2005, pp. 318-23, doi:10.3989/revmetalm.2005.v41.iExtra.1048.