@book { EineWegbeschreibungzumFhrungsstandard,
    title = "Eine Wegbeschreibung zum Führungsstandard",
    author = "Christian {Crain}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832475635",
    url = "https://m.diplom.de/document/222841"
}