Wang, Yu, et al. “Design and Experimental Study of the Fertilizer Applicator With Vertical Spiral Fluted Rollers”. International Journal of Agricultural and Biological Engineering, vol. 16, no. 5, Dec. 2023, pp. 80-87, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/7555.