@book { DieInsolvenz,
    title = "Die Insolvenz",
    subtitle = "Chance oder Risiko für landwirtschaftliche Unternehmen",
    author = "Michael {Hartmann}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832475406",
    url = "https://m.diplom.de/document/222821"
}