Sankar K. Pal Rough-Fuzzy Granulation, Rough Entropy and Image Segmentation. 3-6 2007 conf/asiams/2007 Asia International Conference on Modelling and Simulation http://doi.ieeecomputersociety.org/10.1109/AMS.2007.84 db/conf/asiams/ams2007.html#Pal07