MOOSE-Chem2: Exploring LLM Limits in Fine-Grained Scientific Hypothesis Discovery via Hierarchical Search - Yang, Zonglin; Liu, Wanhao; Gao, Ben; Liu, Yujie; Li, Wei; Xie, Tong; Bing, Lidong; Ouyang, Wanli; Cambria, Erik; Zhou, Dongzhan (Advances in Neural Information Processing Systems, 2025)