@book { FondsbetasinderBaisseEineempirischeAnalyse,
    title = "Fondsbetas in der Baisse: Eine empirische Analyse",
    author = "Oliver {Liefke}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297056"
}