@book { MarkencontrollingfrDienstleistungen,
    title = "Markencontrolling für Dienstleistungen",
    author = "Mario {Flury}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832484194",
    url = "https://m.diplom.de/document/223607"
}