Gortz, W. “Tests on the Automation of Rotary Kilns With Heat Exchangers in Gas Suspension”. Materiales de Construcción 18, no. 129 (March 31, 1968): 6–14. Accessed April 28, 2024. https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/1636.