Jia, Honglei, et al. “Optimized Design and Experiment of Spiral-Type Intra-Row Weeding Actuator for Maize (Zea Mays L.) Planting”. International Journal of Agricultural and Biological Engineering, vol. 14, no. 6, Dec. 2021, pp. 54-60, https://www.ijabe.org/index.php/ijabe/article/view/6542.