21.
Díaz-Guillén J.C., Campa-Castilla A., Pérez-Aguilar S.I., Granda-Gutiérrez E.E., Garza-Gómez A., Candelas-Ramírez J., Méndez-Méndez R. (2009), Effect of duty cycle on surface properties of AISI 4340 using a pulsed plasma nitriding process, Superficies y Vacío, Vol. 22, 1-4.