Du, Xiaoqiang, et al. “Design and Experiment of the Comb-Brush Harvesting Machine With Variable Spacing for Oil-Tea Camellia Fruit”. International Journal of Agricultural and Biological Engineering, vol. 14, no. 1, Feb. 2021, pp. 172-7, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/5703.