@book { NeueSteuerungsinstrumente,
    title = "Neue Steuerungsinstrumente",
    author = "Oliver {Loritz}",
    year = "2005",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832440541",
    url = "https://m.diplom.de/document/219683"
}