Cliff Randell Erik Geelhoed Alan J. Dix Henk L. Muller Exploring the Effects of Target Location Size and Position System Accuracy on Location Based Applications. 305-320 2006 conf/pervasive/2006 Pervasive http://dx.doi.org/10.1007/11748625_19 db/conf/pervasive/pervasive2006.html#RandellGDM06