@inproceedings{dethlefs-cuayahuitl-2011-hierarchical,
    title = "Hierarchical Reinforcement Learning and Hidden {M}arkov Models for Task-Oriented Natural Language Generation",
    author = "Dethlefs, Nina  and
      Cuay{\'a}huitl, Heriberto",
    editor = "Lin, Dekang  and
      Matsumoto, Yuji  and
      Mihalcea, Rada",
    booktitle = "Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies",
    month = jun,
    year = "2011",
    address = "Portland, Oregon, USA",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/P11-2115/",
    pages = "654--659"
}