Nascimento, Paula, Rodrigo Aguas, Débora de Lima, Xiao Kong, Bruno Osiek, Geraldo Xexéo, and Jano de Souza.
" Sentiment analysis of news-focused tweets." <em>Proceedings of the 1st Brazilian Workshop on Social Network Analysis and Mining,
Curitiba, 2012</em>. SBC, 2012,  
pp.25-36.