Spencer Rugaber Nissim Harel Srihari Govindharaj Dean F. Jerding Problems Modeling Web Sites and User Behavior. 83-94 2006 conf/wse/2006 WSE http://doi.ieeecomputersociety.org/10.1109/WSE.2006.16 db/conf/wse/wse2006.html#RugaberHGJ06