Huang, Zhaofu, Jun Xue, Bo Ming, Keru Wang, Ruizhi Xie, Peng Hou, and Shaokun Li. 2020. “Analysis of Factors Affecting the Impurity Rate of Mechanically-Harvested Maize Grain in China”. International Journal of Agricultural and Biological Engineering 13 (5). Beijing, China:17-22. https://ijabe.org/index.php/ijabe/article/view/6038.