VVC-Gym: A Fixed-Wing UAV Reinforcement Learning Environment for Multi-Goal Long-Horizon Problems - Gong, Xudong; Dawei, Feng; Xu, Kele; wang, weijia; Sun, Zhangjun; Zhou, Xing; Zheng, Si; Ding, Bo; Wang, Huaimin (International Conference on Learning Representations, 2025)