Ma, Duanxu, et al. “DEM-CFD-Based Simulation and Optimization of a Combined Pneumatic-Centrifugal Wheat Seed-Metering Device”. International Journal of Agricultural and Biological Engineering, vol. 18, no. 5, Oct. 2025, pp. 127-41, https://www.ijabe.org/index.php/ijabe/article/view/9438.