Cirqueira , Douglas , Lucas  Vinícius , Márcia  Pinheiro , Antônio  Jacob Junior , Fábio  Lobato , and Ádamo Santana.
" Opinion Label: A Gamified Crowdsourcing System for Sentiment." <em>Companion Proceedings of the 23rd Brazilian Symposium on Multimedia and Web,
Gramado, 2017</em>. SBC, 2017,  
pp.209-213.