http://doi.ieeecomputersociety.org/10.1109/PDIS.1996.568672 Virgilio Almeida Azer Bestavros Mark Crovella Adriana de Oliveira Characterizing Reference Locality in the WWW. 92-103 PDIS1996/P092.pdf 1996 conf/pdis/96 PDIS db/conf/pdis/pdis96.html#AlmeidaBCO96