1. Carbon Films: Basic Knowledge, Film Types and Properties Standard. VDI 2840:2012–06. Available From: BEUTH;Standards Germany,2012
2. High performance hard carbon coatings (diamond-like coatings)
3. H. Luethje, J. Brand, Sensor zur Zustandsbestimmung von Kenngroessen an mechanischen Komponenten, Deutsches Patent DE 199 54 164A1, 1999.
4. Sensor for Determining the State of Parameters on Mechanical Components While Using Amorphous Carbon Layers Having Piezoresistive Properties, Wo02054031 A1;Luethje,2002
5. H. Luethje, J. Brand, US patent No.7073390, 2006.