Li, Y.; Bingxin, Y.; Yiming, Y.; Xiantao, H.; Quanwei, L.; Zhijie, L.; Xiaowei, Y.; Tao, C.; Dongxing, Z. Global Overview of Research Progress and Development of Precision Maize Planters. Int J Agric & Biol Eng 2016, 9, 9-26.