@article{hardorjustunreacheddiagnosingthesampling,
  title = {Hard or Just Unreached? Diagnosing the Sampling Blind Spot in Math-Reasoning Difficulty Estimation},
  author = {Luca Zhou and Sajel Shah and Emanuele Rodolà and Roberto Dessì},
  year = {2026},
  eprint = {2606.19636},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.19636},
}