@incollection{balahur2012opal,
  title={OpAL: A System for Mining Opinion from Text for Business Applications},
  author={Balahur, Alexandra and Boldrini, Ester and Montoyo, Andr{\'e}s and Mart{\'\i}nez-Barco, Patricio},
  booktitle={Business Intelligence Applications and the Web: Models, Systems and Technologies},
  pages={147--177},
  year={2012},
  publisher={IGI Global Scientific Publishing}
}

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