@book { VonderWirklichkeitzurUtopie,
    title = "Von der Wirklichkeit zur Utopie",
    subtitle = "Der Weg eines Theologen",
    author = "Norbert {Greinacher}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1136195"
}