Ask a Strong LLM Judge when Your Reward Model is Uncertain - Xu, Zhenghao; Lu, Qin; Zhang, Qingru; Qiu, Liang; Hong, Ilgee; Yu, Changlong; Yao, Wenlin; Liu, Yao; Jiang, Haoming; Li, Lihong; Yun, Hyokun; Zhao, Tuo (Advances in Neural Information Processing Systems, 2025)