Yallappa, Dengeru, et al. “Downwash Airflow Distribution Pattern of Hexa-Copter Unmanned Aerial Vehicles”. International Journal of Agricultural and Biological Engineering, vol. 17, no. 4, Sept. 2024, pp. 24-34, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/7754.