@inproceedings{yu-etal-2026-difficulty,
    title = "Difficulty-Adaptive Tree-Structured Policy Optimization for Expanding Reasoning Coverage in {RLVR}",
    author = "Yu, Youngjun  and
      Jang, Sanghwan  and
      Yu, Hwanjo",
    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.1137/",
    doi = "10.18653/2026.findings-emnlp.1137",
    pages = "24084--24110",
    ISBN = "979-8-89176-462-0"
}