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Subnetwork extraction by SICERS versus classical community-detection algorithms on a 
matrix with a structure of 
: (a) spectral clustering with 10 communities in Von Luxburg (2007); (b) Louvain method by Blondel and others (2008); (c) INFOMAP algorithm by Rosvall and Bergstrom (2008); (d) SICERS community detection.
