PolArt: A Robust Tool for Sentiment Analysis Manfred Klenner author Angela Fahrni author Stefanos Petrakis author 2009-05 text Proceedings of the 17th Nordic Conference of Computational Linguistics (NODALIDA 2009) Kristiina Jokinen editor Eckhard Bick editor Northern European Association for Language Technology (NEALT) Odense, Denmark conference publication klenner-etal-2009-polart https://aclanthology.org/W09-4635/ 2009-05 235 238