@book { StaatundKircheninderDDR,
    title = "Staat und Kirchen in der DDR",
    author = "Horst {Dähn} and Joachim {Heise}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095071"
}