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  author = {Peter Turney},
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  author = {Janyce Wiebe},
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  author = {Janyce Wiebe and Rebecca Bruce and Matthew Bell and Melanie Martin and Theresa Wilson},
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  author = {Janyce Wiebe and Ellen Riloff},
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  author = {Janyce Wiebe and Theresa Wilson and Matthew Bell},
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@phdthesis{twilsonthesis,
  author = {Theresa Wilson},
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  year = {2007}
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@inproceedings{yiniblack2005,
  author = {Yi, Jeonghee and Niblack, Wayne},
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  publisher = {IEEE Computer Society},
  year = {2005},
  pages = {1073-1083},
  url = {http://ieeexplore.ieee.org/iel5/9680/30564/01410217.pdf},
  doi = {http://doi.ieeecomputersociety.org/10.1109/ICDE.2005.132}
}

@inproceedings{yuhatzivassiloglou2003,
  author = {Hong Yu and Vasileios Hatzivassiloglou},
  title = {Towards Answering Opinion Questions: {S}eparating Facts from Opinions and Identifying the Polarity of Opinion Sentences},
  booktitle = {emnlp2003},
  year = {2003},
  pages = {129-136}
}