Palotti, J., T. Salles, G. L. Pappa, F. Arcanjo, M. A. Gonçalves, and W. Meira Jr. “Estimating the Credibility of Examples in Automatic Document Classification”. Journal of Information and Data Management, vol. 1, no. 3, Oct. 2010, p. 439, doi:10.5753/jidm.2010.1287.