@INPROCEEDINGS{Souza11constructionof, author = {Marlo Souza and Renata Vieira and Débora Busetti and Rove Chishman and Isa Mara Alves and Faculdade De Letras Unisinos}, title = {Construction of a Portuguese Opinion Lexicon from multiple resources}, booktitle = {In 8th Brazilian Symposium in Information and Human Language Technology - STIL, Mato Grosso}, year = {2011} }