@book { VomElchzumWerkzeug,
    title = "Vom Elch zum Werkzeug",
    author = "Ilka {Mellert}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832411619",
    url = "https://m.diplom.de/document/217084"
}