Alzennyr Da Silva Francisco de Assis Tenório de Carvalho Yves Lechevallier Brigitte Trousse Characterizing visitor groups from web data streams. 389-392 2006 GrC http://ieeexplore.ieee.org/xpls/abs_all.jsp?isnumber=34297&arnumber=1635822&count=189&index=86 conf/grc/2006 db/conf/grc/grc2006.html#SilvaCLT06