@book { EinfhrungderMautinDeutschland,
    title = "Einführung der Maut in Deutschland",
    author = "Marcus {Heinke}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832473372",
    url = "https://m.diplom.de/document/222628"
}