Xianzhe, Zheng, et al. “Process Analysis for an Alfalfa Rotary Dryer Using an Improved Dimensional Analysis Method”. International Journal of Agricultural and Biological Engineering, vol. 2, no. 3, Sept. 2009, pp. 76-82, https://www.ijabe.migration.pkpps06.publicknowledgeproject.org/index.php/ijabe/article/view/92.