1. Long, L., Wei, S., Chen, H.: Research on formation keeping of multi-rotor UAVs based on improved virtual structure method. In: Proceedings of the 2nd International Conference on Artificial Intelligence and Computer Science, pp. 778–784 (2020)
2. Zhou, D., Wang, Z., Schwager M.: Agile coordination and assistive collision avoidance for quadrotor swarms using virtual structures. IEEE Trans. Robot. 916–923 (2018)
3. Chang, B.L., Quee, S.N.: A flexible virtual structure formation keeping control for fixed-wing UAVs. In: 9th IEEE International Conference on Control and Automation (2011)
4. Jiang, Y., Yang, J., Shunzhang, W., Lei, L.: A multi-UAV formation maintaining method based on formation reference point. In: Proceedings of 2020 International Conference on Computer Science and Communication Technology, pp. 132–139 (2020)
5. Zhuang, S., Xiaoping, Z., Zhou, Z., Bo, Z., Yanxiong, W.: Multi-UAV formation distributed maintenance control in 3D dynamic environment. Control Decis. 31(06), 1065–1072 (2016)