@article{henderson-etal-2008-hybrid,
    title = "Hybrid Reinforcement/Supervised Learning of Dialogue Policies from Fixed Data Sets",
    author = "Henderson, James  and
      Lemon, Oliver  and
      Georgila, Kallirroi",
    journal = "Computational Linguistics",
    volume = "34",
    number = "4",
    year = "2008",
    url = "https://preview.aclanthology.org/fix-sig-urls/J08-4002/",
    doi = "10.1162/coli.2008.07-028-R2-05-82",
    pages = "487--511"
}