Dai, Fei, et al. “Design and Field Test of Crosswise Belt Type Whole Plastic-Film Ridging-Mulching Corn Seeder on Double Ridges”. International Journal of Agricultural and Biological Engineering, vol. 12, no. 4, Aug. 2019, pp. 88-96, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/4860.