Nan, Li, Zhang Chunlong, Chen Ziwen, Ma Zenghong, Sun Zhe, Yuan Ting, Li Wei, and Zhang Junxiong. 2015. “Crop Positioning for Robotic Intra-Row Weeding Based on Machine Vision”. International Journal of Agricultural and Biological Engineering 8 (6). Beijing, China:20-29. https://ijabe.org/index.php/ijabe/article/view/1932.