BÖRNER, K.; BURLACOV, I.; SPIES, H.-J.; BIERMANN, H.; HAMANN, S.; RÖPCKE, J. Investigations on the active screen plasma nitriding process. International Conference on Plasma Surface Engineering, [S. l.], v. 2, n. 13, p. 96–99, 2013. DOI: 10.3384/wcc2/96-99. Disponível em: https://wcc.ep.liu.se/index.php/PSE/article/view/401. Acesso em: 20 jan. 2022.