@book { Investition,
    title = "Investition",
    subtitle = "Schwachstellenanalyse des Investitionsbereichs und Investitionsrechnung",
    author = "Hans {Blohm} and Klaus {Lüder} and Christina {Schaefer}",
    year = "2013",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220784"
}