G. , O. Rosset, S. Grouin, C. Zweigenbaum, P. Et et al., Extended named entity annotation on ocred documents : From corpus constitution to evaluation campaign, Proceedings of the 8 th LREC, pp.3126-3131, 2012.

G. , C. , S. , S. R. Zweigenbaum, P. Fort et al., Proposal for an extension of traditional named entities : From guidelines to evaluation, an overview, Proceedings of the Fifth Law Workshop (LAW V), pp.92-100, 2011.

M. , J. Et, F. , and T. , Delta tfidf : An improved feature space for sentiment analysis, 2009.

M. , A. L. Daly, R. E. Pham, P. T. Huang, D. Ng et al., Learning word vectors for sentiment analysis, Proceedings of the 49 th Annual Meeting of the ACL, pp.142-150, 2011.

F. , R. Chang, K. Hsieh, C. Wang, X. et al., Liblinear : A library for large linear classification, J. Mach. Learn. Res, vol.9, pp.1871-1874, 2008.

P. , A. Et, P. , and P. , Normalization of term weighting scheme for sentiment analysis, Language and Technology Conference : Human Language Technologies as a Challenge for Computer Science and Linguistics, pp.415-419, 2011.

P. , G. Et, T. , and M. , A study of information retrieval weighting schemes for sentiment analysis, Proceedings of the 48 th Annual Meeting of the ACL, pp.1386-1395, 2010.

P. , P. Pak, A. Et, M. , and D. , Annotations for opinion mining evaluation in the industrial context of the doxa project, Proceedings of the 7 th International Conference on Language Resources and Evaluation (LREC), 2010.