Michael Grossniklaus Moira C. Norrie Beat Signer Nadir Weibel Putting Location-Based Services on the Map. 1-11 2006 conf/w2gis/2006 W2GIS http://dx.doi.org/10.1007/11935148_1 db/conf/w2gis/w2gis2006.html#GrossniklausNSW06