Bich-Liên Doan Michel Beigbeder Virtual WWW Documents: a Concept to Explicit the Structure of WWW Sites. 1999 conf/ecir/1999 BCS-IRSG Annual Colloquium on IR Research http://ewic.bcs.org/conferences/1999/21stirsg/papers/paper3.htm db/conf/ecir/ecir1999.html#DoanB99