@book { WolframsParzival,
    title = "Wolfram’s Parzival",
    subtitle = "On the Genesis of its Poetry",
    author = "Marianne {Wynn}",
    year = "1985",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1094843"
}