@book { CommunicationCenterimelektronischenHandel,
    title = "Communication Center im elektronischen Handel",
    author = "Thorsten {Weyer}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832450588",
    url = "https://m.diplom.de/document/220591"
}