@inproceedings{aoki-yamamoto-2007-opinion,
    title = "Opinion Extraction based on Syntactic Pieces",
    author = "Aoki, Suguru  and
      Yamamoto, Kazuhide",
    booktitle = "Proceedings of the 21st Pacific Asia Conference on Language, Information and Computation",
    month = nov,
    year = "2007",
    address = "Seoul National University, Seoul, Korea",
    publisher = "The Korean Society for Language and Information (KSLI)",
    url = "https://preview.aclanthology.org/fix-sig-urls/Y07-1007/",
    doi = "http://hdl.handle.net/2065/29112",
    pages = "76--85"
}