Michael R. Fellows Jiong Guo Christian Komusiewicz Rolf Niedermeier Johannes Uhlmann Graph-Based Data Clustering with Overlaps. 516-526 2009 COCOON http://dx.doi.org/10.1007/978-3-642-02882-3_51 conf/cocoon/2009 db/conf/cocoon/cocoon2009.html#FellowsGKNU09