@book { DiedeutscheMitte,
    title = "Die deutsche Mitte",
    subtitle = "Politische Betrachtungen des Zauberbergs",
    author = "Metin {Toprak}",
    year = "1999",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1088943"
}