Richong Zhang Michael A. Shepherd Jack Duffy Carolyn R. Watters Automatic Web Page Categorization using Principal Component Analysis. 73 2007 conf/hicss/2007 HICSS http://doi.ieeecomputersociety.org/10.1109/HICSS.2007.98 db/conf/hicss/hicss2007.html#ZhangSDW07