Songchao Z, Xinyu X, Zhu S, Lixin Z, Yongkui J. Downwash distribution of single-rotor unmanned agricultural helicopter on hovering state. Int J Agric & Biol Eng [Internet]. 2017 Sep. 30 [cited 2025 Dec. 27];10(5):14-2. Available from: https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/3079