@book { OstmittelundSdosteuropaimUmbruch,
    title = "Ostmittel- und Südosteuropa im Umbruch",
    author = "Klaus-Detlev {Grothusen}",
    year = "1993",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b12836",
    url = "https://www.peterlang.com/document/1067208"
}