1Editorial:special issue on analysis and control of complex systems in honor of the 90th birthday of Professor Huashu QinYiguang Hong, Shengwei Mei, Ping Yang343-3442An overview on the distributed internal model approach and its applicationsYoufeng Su, He Cai, Jie Huang345-3593An adaptive large neighborhood search for the multi-point dynamic aggregation problemShengyu Lu, Bin Xin, Jie Chen, Miao Guo360-3784Game-theoretic multi-agent motion planning in a mixed environmentXiaoxue Zhang, Lihua Xie379-3935A hierarchical multi-UAV cooperative framework for infrastructure inspection and reconstructionChuanxiang Gao, Xinyi Wang, Xi Chen, Ben M.Chen394-4056Distributed order estimation for continuous-time stochastic systemsXinghua Zhu, Zhixin Liu, Xiaoming Hu406-4187Online distributed optimization with stochastic gradients:high probability bound of regretsYuchen Yang, Kaihong Lu, Long Wang419-4308Distributed algorithm for solving variational inequalities over time-varying unbalanced digraphsYichen Zhang, Yutao Tang, Zhipeng Tu, Yiguang Hong431-4419Safe formation control of multiple unmanned aerial vehicles:control design and safety-stability analysisHaoqi Li, Jiangping Hu, Qingrui Zhou, Bijoy K.Ghosh442-45410Integral input-to-state stability of systems with small delaysR.H.Harsha Nawarathna, Yuandan Lin, Yuan Wang455-46711Global practical stabilization of the double integrator system with an imperfect sensor and subject to a bounded disturbanceZhiyuan Zhu, Yuanlong Li, Zongli Lin468-47812Model-free method for LQ mean-field social control problems with one-dimensional state spaceZhenhui Xu, Tielong Shen479-48613Online control for pressure regulation of oxygen mask based on neural networkLigan Zhao, Qinglin Sun, Hao Sun, Jin Tao, Zengqiang Chen487-501