1. van Oss, H. G.Background Facts and Issues Concerning Cement and Cement Data, Open-File Report 2005-1152,U.S. Geological Survey,Reston, VA, 2005.
2. Minerals Yearbook 2007, Cement;U.S. Geological Survey:Reston, VA, 2007. Available via the Internet athttp://minerals.usgs.gov.
3. Mineral Commodity Summaries—Cement;U.S. Geological Survey:Reston, VA, 2014. Available via the Internet athttp://minerals.usgs.gov.
4. VDZ Activity Report 2007–2009;Verband Deutscher Zeitschriftenverleger (VDZ):Berlin, 2009. Available via the Internet athttp://www.vdz.de.
5. CARBON DIOXIDE EMISSIONS FROM THE GLOBAL CEMENT INDUSTRY