@book { SozialforschunginOstdeutschland,
    title = "Sozialforschung in Ostdeutschland",
    author = "Hartmut {Salzwedel} and Johannes {Gordesch}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1113889"
}