@book { MglichkeitenzurStrkungdesEigenkapitalsfrdenMittelstand,
    title = "Möglichkeiten zur Stärkung des Eigenkapitals für den Mittelstand",
    author = "Michael {Klenz}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836617642",
    url = "https://m.diplom.de/document/226053"
}