@book { InternetbasierterElectronicCommerce,
    title = "Internet-basierter Electronic Commerce",
    author = "Martin {Houzer}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832416843",
    url = "https://m.diplom.de/document/217559"
}