Gu, Xueqiang, Yu Zhang, Jing Chen, and Lincheng Shen. “Collision-Free Multiple Unmanned Combat Aerial Vehicles Cooperative Trajectory Planning for Time-Critical Missions Using Differential Flatness Approach”. Defence Science Journal 64, no. 1 (January 17, 2014): 13-20. Accessed July 3, 2024. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/2999.