@book { Krebserleben,
    title = "Krebs (er)leben",
    author = "Hanna {Mayer} and Helga {Zellhofer} and Helga {Zellhofer}",
    year = "2016",
    publisher = "facultas",
    address = "Wien, Österreich",
    url = "https://campus-lizenzen.facultas.at/document/338187"
}