Bellas, Leornado, Gemma Castro, Laura Mera, José L. Mier, Ana García, and Angel Varela. “Comparative Study of AISI 4340 and AISI 347 Nitrocarburizing by Tenifer-QPQ® Process”. Revista de Metalurgia 55, no. 1 (March 30, 2019): e136. Accessed May 4, 2024. https://revistademetalurgia.revistas.csic.es/index.php/revistademetalurgia/article/view/1451.