Amazonas, J. R., A. B. de Lima, and M. R. Pereira Barretto. “Spectra-Based Sentiment Analysis”. INFOCOMP Journal of Computer Science, vol. 17, no. 2, Dec. 2018, pp. 01-06, http://infocomp.dcc.ufla.br/index.php/infocomp/article/view/571.