@article{whenknowledgeisnotfreecostawareevidences,
  title = {When Knowledge Is Not Free: Cost-Aware Evidence Selection in Retrieval-Augmented Generation},
  author = {Mingyan Wu and Han Yang and Omer Ben-Porat and Yftah Ziser},
  year = {2026},
  eprint = {2606.02245},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.02245},
}