@book { LiquidittderKapitalmrkte,
    title = "Liquidität der Kapitalmärkte",
    author = "Ouafya {Sai} and Marin {Tadinac}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836630023",
    url = "https://m.diplom.de/document/226812"
}