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ISO/IEC 14443 Identification cards – Contactless integrated circuit cards – Proximity cards is an international standard that defines proximity cards used for identification, and the transmission protocols for communicating with it.^[1]^[2]^[3]^[4]

^ "ISO/IEC 14443-2:2020". ISO. Retrieved 2018-12-12.
^ "ISO/IEC 14443-2:2020". ISO. Retrieved 2020-07-12.
^ "ISO/IEC 14443-3:2018". ISO. Retrieved 2018-12-12.
^ "ISO/IEC 14443-4:2018". ISO. Retrieved 2018-12-12.