Eleftherios Tiakas Apostolos N. Papadopoulos Alexandros Nanopoulos Yannis Manolopoulos Node and edge selectivity estimation for range queries in spatial networks. 328-352 2009 34 Inf. Syst. 3 http://dx.doi.org/10.1016/j.is.2008.09.004 db/journals/is/is34.html#TiakasPNM09