ANGELL, IAN; KIETZMANN, JAN (December 2006). "?RFID AND THE END OF CASH"(PDF). COMMUNICATIONS OF THE ACM. 49 (12): 91–96. Archived from the original(PDF) on 24 February 2014.
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ANGELL, IAN; KIETZMANN, JAN (December 2006). "?RFID AND THE END OF CASH"(PDF). COMMUNICATIONS OF THE ACM. 49 (12): 91–96. Archived from the original(PDF) on 24 February 2014.