Using Wavelets to Classify Documents. - Geraldo Xexéo; Jano Moreira de Souza; Patrícia F. Castro; Wallace A. Pinheiro (Web Intelligence, 2008)

Granules of Words to Represent Text: An Approach Based on Fuzzy Relations and Spectral Clustering. - Patrícia F. Castro; Geraldo Xexéo (ICCSA (4), 2012)

Granules of Words from Fuzzy Relations and Spectral Clustering. - Patrícia F. Castro; Geraldo Xexéo (WEBIST, 2012)