MMSearch-Plus: Benchmarking Provenance-Aware Search for Multimodal Browsing Agents - Tao, Xijia; Yihua, Teng; Su, Xinxing; Fu, Xinyu; Wu, Jihao; Tao, Chaofan; Liu, Ziru; Bai, Haoli; Liu, Rui; Kong, Lingpeng (International Conference on Learning Representations, 2026)