Adriana Prado Cristiane Targa Alexandre Plastino Improving Direct Counting for Frequent Itemset Mining. 371-380 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3181&spage=371 2004 conf/dawak/2004 DaWaK db/conf/dawak/dawak2004.html#PradoTP04