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2. Issuer PIN Security Guidelines. Technical report, VISA (November 2010)
3. ISO 9564:2011 Financial services – Personal Identification Number (PIN) management and security. International Organisation for Standardisation (2011)
4. Bátiz-Lazo, B., Reid, R.J.: The Development of Cash-Dispensing Technology in the UK. IEEE Annals of the History of Computing 33, 32–45 (2011)
5. Bond, M., Zieliński, P.: Decimalisation table attacks for PIN cracking. Technical Report UCAM-CL-TR-560, University of Cambridge (January 2003)