Zhu, Zhifang, Guohuan Wu, Bingliang Ye, and Yongchang Zhang. 2023. “Reverse Design and Tests of Vegetable Plug Seedling Pick-up Mechanism of Planetary Gear Train With Non-Circular Gears”. International Journal of Agricultural and Biological Engineering 16 (2):96-102. https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/7423.