Christian Metzger Christian Floerkemeier Philippe Bourquin Elgar Fleisch Making Radio Frequency Identification Visible - A Watchdog Tag. 352-356 2007 conf/percom/2007w PerCom Workshops http://dx.doi.org/10.1109/PERCOMW.2007.63 db/conf/percom/percomw2007.html#MetzgerFBF07