@book { DasGegenstzlicheinHeinrichFederersLebenundWerk,
    title = "Das Gegensätzliche in Heinrich Federers Leben und Werk",
    author = "Hedi {Krähenmann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1071126"
}