@book { PreisgestaltungimbimodalenVerkehr,
    title = "Preisgestaltung im bimodalen Verkehr",
    author = "Michael {Tippner}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832428808",
    url = "https://m.diplom.de/document/218607"
}