@book { ePaymentsysteme,
    title = "ePaymentsysteme",
    subtitle = "Eine Analyse existierender ePaymentsysteme illustriert an zwei Fallbeispielen aus dem Content-Bereich",
    author = "Thomas {Bender}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832472474",
    url = "https://m.diplom.de/document/222550"
}