Shao, Yuanyuan, et al. “Development of a Multi-Adaptive Feeding Device for Automated Plug Seedling Transplanter”. International Journal of Agricultural and Biological Engineering, vol. 14, no. 2, Apr. 2021, pp. 91-96, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/6003.