nlp.cs.aueb.gr: Two Stage Sentiment Analysis Prodromos Malakasiotis author Rafael Michael Karampatsis author Konstantina Makrynioti author John Pavlopoulos author 2013-06 text Second Joint Conference on Lexical and Computational Semantics (*SEM), Volume 2: Proceedings of the Seventh International Workshop on Semantic Evaluation (SemEval 2013) Suresh Manandhar editor Deniz Yuret editor Association for Computational Linguistics Atlanta, Georgia, USA conference publication malakasiotis-etal-2013-nlp https://aclanthology.org/S13-2094/ 2013-06 562 567