Börner, Kristian, Igor Burlacov, Heinz-Joachim Spies, Horst Biermann, Spetham Hamann, and Jürgen Röpcke. 2013. “Investigations on the Active Screen Plasma Nitriding Process”. International Conference on Plasma Surface Engineering 2 (13):96-99. https://doi.org/10.3384/wcc2/96-99.