YONGGUANG, Hu; SHENGZHONG, Liu; WENYE, Wu; JIZHANG, Wang; JIANWEN, Shen. Optimal flight parameters of unmanned helicopter for tea plantation frost protection. International Journal of Agricultural and Biological Engineering, Beijing, China, v. 8, n. 5, p. 50–57, 2015. Disponível em: https://ijabe.org/index.php/ijabe/article/view/1655. Acesso em: 31 mar. 2026.