Huang, Xin, et al. “Design Method and Experiment of Machinery for Combined Application of Seed, Fertilizer and Herbicide”. International Journal of Agricultural and Biological Engineering, vol. 12, no. 4, Aug. 2019, pp. 63-71, https://ijabe.migration.pkpps06.publicknowledgeproject.org/index.php/ijabe/article/view/4679.