@book { FiftyfiftyEltern,
    title = "Fifty-fifty-Eltern",
    author = "Marie {Zeisler} and Isabel {Robles Salgado}",
    year = "2021",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/993645"
}