@article{cipocounterfactualunlearningforlargereas,
  title = {CiPO: Counterfactual Unlearning for Large Reasoning Models through Iterative Preference Optimization},
  author = {Junyi Li and Yongqiang Chen and Ningning Ding},
  year = {2026},
  eprint = {2604.15847},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2604.15847},
}