Freddy López Villafuerte Kirsten Terfloth Jochen H. Schiller Using Network Density as a New Parameter to Estimate Distance. 30-35 2008 ICN http://doi.ieeecomputersociety.org/10.1109/ICN.2008.57 conf/icn/2008 db/conf/icn/icn2008.html#VillafuerteTS08