DF40: Toward Next-Generation Deepfake Detection - Yan, Zhiyuan; Yao, Taiping; Chen, Shen; Zhao, Yandan; Fu, Xinghe; Zhu, Junwei; Luo, Donghao; Wang, Chengjie; Ding, Shouhong; Wu, Yunsheng; Yuan, Li (Advances in Neural Information Processing Systems, 2024)