Shi, Yinyan, et al. “Fertilization Strategy and Application Model Using a Centrifugal Variable-Rate Fertilizer Spreader”. International Journal of Agricultural and Biological Engineering, vol. 11, no. 6, Dec. 2018, pp. 41-48, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/3789.