@book { DieBetriebsaufspaltung,
    title = "Die Betriebsaufspaltung",
    author = "Ralf {Böhler}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832413446",
    url = "https://m.diplom.de/document/217027"
}