@articleHaeb-Umbach_Peschke_2007, title=A Novel Similarity Measure for Positioning Cellular Phones by a Comparison With a Database of Signal Power Levels, volume=56, DOI=10.1109/TVT.2006.889563, number=1, journal=IEEE Transactions on Vehicular Technology, author=Haeb-Umbach, Reinhold and Peschke, Sven, year=2007, pages=368–372