1. Measuring the efficiency of decision making units;Charnes;European Journal of Operations Research,1979
2. Franz Güde GmbH, website: http://www.guede-solingen.de (April 2018).
3. DIN EN ISO 4287:2010-06, Geometrical Product Specifications (GPS) – Surface texture: Profile method – Terms, definitions and surface texture parameters (ISO 4287:1997 + Cor 1:1998 + Cor 2:2005 + Amd 1:2009); German version EN ISO 4287:1998 + AC:2008 + A1:2009.
4. Multivariate analysis of aperiodic surface topography within high precision grinding processes;Bracke;Intelligent Computation in Manufacturing Engineering,2018
5. DIN EN ISO 2813:2014-02, Paints and varnishes – Determination of gloss value at 20°, 60° and 85° (ISO 2813:2014); German version EN ISO 2813:2014.