Kong, C. 2026. Budgeted Multi-Hop Retrieval Agents with Evidence-Chain Reliability and Cost-Aware Abstention. 知识学习与科学技术期刊 ISSN：2959-6386（在线）. 5, 2 (6月 2026), 79–102. DOI:https://doi.org/10.60087/jklst.vol5.n2.006.