Knowledge Externalization: Reversible Unlearning and Modular Retrieval in Multimodal Large Language Models - Li, Jiaqi; You, Zihan; Shen, Ruoyan; Zhang, Shenyu; Zhai, Songlin; Chen, Yongrui; Zhang, Chuanyi; Geng, Jiahui; Karray, Fakhri; Bi, Sheng; Qi, Guilin (International Conference on Learning Representations, 2026)