Yakov A. Kogan David Michaeli Yehoshua Sagiv Oded Shmueli Utilizing the Multiple Facets of WWW Contents. 255-275 1998 28 Data Knowl. Eng. 3 db/journals/dke/dke28.html#KoganMSS98 http://dx.doi.org/10.1016/S0169-023X(98)00026-3