Breast Density Segmentation: A Comparison of Clustering and Region Based Techniques. - Albert Torrent; Anton Bardera; Arnau Oliver; Jordi Freixenet; Imma Boada; Miguel Feixes; Robert Marti; Xavier Lladó; Josep Pont; Elsa Pérez; Salvador Pedraza; Joan Martí (Digital Mammography / IWDM, 2008)