Fence Monitoring - Experimental Evaluation of a Use Case for Wireless Sensor Networks. - Georg Wittenburg; Kirsten Terfloth; Freddy López Villafuerte; Tomasz Naumowicz; Hartmut Ritter; Jochen H. Schiller (EWSN, 2007)

DIN: An Ad-Hoc Algorithm to Estimate Distances in Wireless Sensor Networks. - Freddy López Villafuerte; Jochen H. Schiller (ADHOC-NOW, 2008)

Using Network Density as a New Parameter to Estimate Distance. - Freddy López Villafuerte; Kirsten Terfloth; Jochen H. Schiller (ICN, 2008)

Localization of wireless sensor nodes based on local network density. - Freddy López Villafuerte (2010)