VideoLucy: Deep Memory Backtracking for Long Video Understanding - Zuo, Jialong; Deng, Yongtai; Kong, Lingdong; Yang, Jingkang; Jin, Rui; Zhang, Yiwei; Sang, Nong; Pan, Liang; Liu, Ziwei; Gao, Changxin (Advances in Neural Information Processing Systems, 2025)