@book { GrenzenundMglichkeitenderGmbHStill,
    title = "Grenzen und Möglichkeiten der GmbH & Still",
    author = "Konstantin {Dittmann}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832454807",
    url = "https://m.diplom.de/document/220792"
}