Michihiro Kuramochi George Karypis GREW-A Scalable Frequent Subgraph Discovery Algorithm. 439-442 2004 conf/icdm/2004 ICDM http://csdl.computer.org/comp/proceedings/icdm/2004/2142/00/21420439abs.htm db/conf/icdm/icdm2004.html#KuramochiK04