Zhang, Bo, Wei Zhang, Liqiang Qi, Haiba Fu, Lijuan Yu, Rui Li, Yue Zhao, and Xinxian Ma. 2018. “Information Acquisition System of Multipoint Soil Surface Height Variation for Profiling Mechanism of Seeding Unit of Precision Corn Planter”. International Journal of Agricultural and Biological Engineering 11 (6):58-64. https://doi.org/10.25165/ijabe.v11i6.4037.