https://www.periodiko.net/%ce%b3%ce%b9%ce%b1%cf%84%ce%af-%cf%84%ce%b1-pin-%ce%b5%ce%af%ce%bd%ce%b1%ce%b9-%cf%84%ce%b5%cf%84%cf%81%ce%b1%cf%88%ce%ae%cf%86%ce%b9%ce%bf%ce%b9-%ce%b1%cf%81%ce%b9%ce%b8%ce%bc%ce%bf%ce%af/
Γιατί τα PIN είναι τετραψήφιοι αριθμοί;