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[2] Duda, W. H.: Cement Data Book, Kap. 20.9 Wärmetauscher und Vorkalzinierer, 2nd Edition, Bauverlag 1977
[3] Harder, J.: Development of the precalcining technology in the cement industry. ZKG International, 10/2002, pp. 34-41
[4] Harder, J.: NOx abatement in the cement industry. ZKG International, 11/2019, pp. 30-37
[5] van Oss, H.G.: Background Facts and Issues Concerning Cement and Cement Data. U.S. Geological Survey (USGS), U.S. Department of the Interior, Report 2005-1152, Reston, VA/USA
[6] Harder, J.: Cement industry challenges in the new decade. ZKG International, 1/2021, pp. 14-23
