@book { IndikatororientierteFrhaufklrung,
    title = "Indikatororientierte Frühaufklärung",
    author = "Andreas {Rotterdam}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836635561",
    url = "https://m.diplom.de/document/227184"
}