Mozafari Maref, M. H., Zahiri, Seyed-Hamid.  Unsupervised Image Clustering Using Central Force Optimization Algorithm Unsupervised Image Clustering Using Central Force Optimization Algorithm. Nashriyyah -i Muhandisi -i Barq va Muhandisi -i Kampyutar -i Iran. 2013;11(2):52-57. doi: