Zhu, Xinhua, et al. “Design and Test of the Bilateral Throwing Soil-Covering Device for Straw Mulching Machine in Orchards”. International Journal of Agricultural and Biological Engineering, vol. 16, no. 1, Mar. 2023, pp. 162-71, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/7010.