Flavio Chierichetti Ravi Kumar Silvio Lattanzi Michael Mitzenmacher Alessandro Panconesi Prabhakar Raghavan On compressing social networks. 219-228 2009 KDD http://doi.acm.org/10.1145/1557019.1557049 conf/kdd/2009 db/conf/kdd/kdd2009.html#ChierichettiKLMPR09