Yihao Qi Zhou Su Qichao Xu Dongfeng Fang Joint Beamforming and Trajectory Optimization for UAV-Assisted Double IRS Secure Transmission System: A Deep Reinforcement Learning Approach. 504-509 2023 MetaCom https://doi.org/10.1109/MetaCom57706.2023.00092 conf/metacom/2023 db/conf/metacom/metacom2023.html#QiSXF23