@book { berparadoxenSozialismus,
    title = "Über paradoxen Sozialismus",
    author = "Ulrich {Knappe}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b14514",
    url = "https://www.peterlang.com/document/1110898"
}