@book { MittelosteuropaNationenStaatenRegionen,
    title = "Mittelosteuropa – Nationen, Staaten, Regionen",
    author = "Eugenie von {Trützschler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099409"
}