@inproceedings{henriksson-velupillai-2010-levels,
    title = "Levels of certainty in knowledge-intensive corpora: an initial annotation study",
    author = "Henriksson, Aron  and
      Velupillai, Sumithra",
    editor = "Morante, Roser  and
      Sporleder, Caroline",
    booktitle = "Proceedings of the Workshop on Negation and Speculation in Natural Language Processing",
    month = jul,
    year = "2010",
    address = "Uppsala, Sweden",
    publisher = "University of Antwerp",
    url = "https://preview.aclanthology.org/fix-sig-urls/W10-3107/",
    pages = "41--45"
}