Jinwu, Wang, Zhou Wenqi, Tian Liquan, Li Shuwei, and Zhang Zhao. 2017. “Virtual Simulation Analysis and Verification of Seed-Filling Mechanism for Dipper Hill-Drop Precision Direct Rice Seeder”. International Journal of Agricultural and Biological Engineering 10 (6). Beijing, China:77-85. https://ijabe.org/index.php/ijabe/article/view/2981.