RAGraph: A General Retrieval-Augmented Graph Learning Framework - Jiang, Xinke; Qiu, Rihong; Xu, Yongxin; Zhang, Wentao; Zhu, Yichen; Zhang, Ruizhe; Fang, Yuchen; Chu, Xu; Zhao, Junfeng; Wang, Yasha (Advances in Neural Information Processing Systems, 2024)