Eric J. Pauwels Greet Frederix Finding Salient Regions in Images: Nonparametric Clustering for Image Segmentation and Grouping. 73-85 1999 75 Computer Vision and Image Understanding 1-2 http://dx.doi.org/10.1006/cviu.1999.0763 db/journals/cviu/cviu75.html#PauwelsF99