Toon Calders Nele Dexters Bart Goethals Mining Frequent Itemsets in a Stream. 83-92 2007 ICDM http://doi.ieeecomputersociety.org/10.1109/ICDM.2007.66 conf/icdm/2007 db/conf/icdm/icdm2007.html#CaldersDG07