Liao, Juan, Ying Zang, Xiwen Luo, Zhiyan Zhou, Yubin Lan, Yu Zang, Xiuyan Gu, Weiming Xu, and Andrew John Hewitt. 2019. “Optimization of Variables for Maximizing Efficacy and Efficiency in Aerial Spray Application to Cotton Using Unmanned Aerial Systems”. International Journal of Agricultural and Biological Engineering 12 (2):10-17. https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/4288.