@inproceedings{xu-etal-2026-stop, title = "{STOP}: Structured On-Policy Pruning of Long-Form Reasoning in Low-Data Regimes", author = "Xu, Chenjun and Zhou, Zhennan and Su, Zhan and Howe, Bill and Wang, Lucy Lu and Wen, Bingbing", editor = "Lee, Hung-Yi and Dev, Sunipa and Li, Jessy and Elliott, Desmond", booktitle = "Findings of the {A}ssociation for {C}omputational {L}inguistics: {EMNLP} 2026", month = oct, year = "2026", address = "Budapest, Hungary", publisher = "Association for Computational Linguistics", url = "https://aclanthology.org/2026.findings-emnlp.672/", doi = "10.18653/2026.findings-emnlp.672", pages = "14109--14125", ISBN = "979-8-89176-462-0" }