Yun, Ge, et al. “Dynamic Model for Sucking Process of Pneumatic Cutting-Type Safflower Harvest Device”. International Journal of Agricultural and Biological Engineering, vol. 9, no. 5, Sept. 2016, pp. 43-50, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/2139.