Y. Yuefeng, R. Berger, und K. Hein. Proceedings of the International Conference on Power Engineering 03, Tokyo, The Japan Society of Mechanical Engineers, (2003)
B. Coda, K. Sandelin, R. Backmann, R. Berger, und K. Hein. Proceedings of the 16th International Conference on Fluidized Bed Combustion, New York, American Society of Mechanical Engineers, (2001)