Spot the Fake: Large Multimodal Model-Based Synthetic Image Detection with Artifact Explanation - Wen, Siwei; ye, junyan; Feng, Peilin; Kang, Hengrui; Wen, Zichen; Chen, Yize; Wu, Jiang; wu, wenjun; He, Conghui; Li, Weijia (Advances in Neural Information Processing Systems, 2025)