@book { PolenundderPragerFrhling1968,
    title = "Polen und der «Prager Frühling» 1968",
    author = "Daniel {Limberger}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1108391"
}