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==References==
{{refs}}
== Further reading ==
* {{cite book|title=Smart Card Handbook|author=W Rankl and W Effing|pages=36–38|date=2003|publisher=John Wiley and Sons|isbn=0470856688|doi=10.1002/047085670X.ch3}}
* {{cite book|title=E-Finance: Elektronische Dienstleistungen in der Finanzwirtschaft|author=Freimut Bodendorf and Susanne Robra-Bissantz|pages=49–50|date=2003|publisher=Oldenbourg|isbn=3486258907|language=German}}
[[Category:Payment systems]]
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