@inproceedings{pighin-moschitti-2009-efficient,
    title = "Efficient Linearization of Tree Kernel Functions",
    author = "Pighin, Daniele  and
      Moschitti, Alessandro",
    editor = "Stevenson, Suzanne  and
      Carreras, Xavier",
    booktitle = "Proceedings of the Thirteenth Conference on Computational Natural Language Learning ({C}o{NLL}-2009)",
    month = jun,
    year = "2009",
    address = "Boulder, Colorado",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/W09-1106/",
    pages = "30--38"
}