1. EUROGYPSUM, Association of European Gypsum Industry, Factsheet on: What is Gypsum?, Brussels, Belgium, 16-07-2007.
2. Bundesverband der Gipsindustrie e.V. (Federal association of gypsum industry), GIPS-Datenbuch (Gypsum Data Book), Darmstadt, Germany 2006.
3. U.S. Geological Survey,. www.minerals.usgs.gov/minerals/pubs/commodity/gypsum, 12/2005.
4. Vergleich von Naturgips und REA-Gips.;Beckert;VGB Kraftwerkstechnik,1991
5. EUROGYPSUM, Association of European Gypsum Industry, FGD Gypsum. Quality Criteria and Analysis Methods, Brussels, Belgium, April 2005.