Tian, Zhang, et al. “Automatic Navigation Path Detection Method Based on Machine Vision for Tillage Machines Working on High Crop Stubble Fields”. International Journal of Agricultural and Biological Engineering, vol. 7, no. 4, Aug. 2014, pp. 29-37, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/1103.