Karamolegkos, Pantelis N., Patrikakis, Charalampos Z., Doulamis, Nikolaos D., Vlacheas, Panagiotis T. and Nikolakopoulos, Ioannis G.. "An evaluation study of clustering algorithms in the scope of user communities assessment." Computers & Mathematics with Applications 58 , no. 8 (2009): 1498--1519.