Construction of a Portuguese Opinion Lexicon from multiple resources Marlo Souza author Renata Vieira author Débora Busetti author Rove Chishman author Isa Mara Alves author 2011 text Proceedings of the 8th Brazilian Symposium in Information and Human Language Technology conference publication souza-etal-2011-construction https://aclanthology.org/W11-4507/ 2011