Abdul Khaliq, Nor Aizatul Nabila, and Muhammd Faiz Ramli. “Obstacle Detection for Unmanned Aerial Vehicle (UAV)”. Progress in Aerospace and Aviation Technology, vol. 2, no. 1, Aug. 2022, pp. 53-64, https://publisher.uthm.edu.my/ojs/index.php/paat/article/view/11969.