@book { MultimanageranstzeimBereichdesPortfoliomanagements,
    title = "Multimanageransätze im Bereich des Portfoliomanagements",
    author = "Nils {Ernst}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1098227"
}