@book { UnsterblichesKnigsbergerSchlo,
    title = "Unsterbliches Königsberger Schloß",
    subtitle = "Zehn Essays- Herausgegeben von Peter Wörster",
    author = "Peter {Wörster}",
    year = "2004",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097082"
}