R3-RAG: Learning Step-by-Step Reasoning and Retrieval for LLMs via Reinforcement Learning. - Yuan Li; Qi Luo; Xiaonan Li; Bufan Li; Qinyuan Cheng; Bo Wang 084; Yining Zheng; Yuxin Wang 005; Zhangyue Yin; Xipeng Qiu (CoRR, 2025)