Tong, Zhenwei, et al. “Design and Experiment of the Components for Soil Flow Direction Control of Hilling Machine Based on EDEM”. International Journal of Agricultural and Biological Engineering, vol. 15, no. 3, June 2022, pp. 122-31, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/5857.