Rui Qi, Fengran Mo, Yufeng Chen, Xue Zhang, Shuo Wang, Hongliang Li, Jinan Xu, Meng Jiang, Jian-Yun Nie, Kaiyu Huang: Language-Coupled Reinforcement Learning for Multilingual Retrieval-Augmented Generation. CoRR abs/2601.14896 (2026)