Vinicius R. Pereira Borges Marcos Aurélio Batista Célia A. Zorzo Barcelos A soft unsupervised two-phase image segmentation model based on global probability density functions. 1687-1692 2011 SMC http://dx.doi.org/10.1109/ICSMC.2011.6083914 conf/smc/2011 db/conf/smc/smc2011.html#BorgesBB11