@book { RandundWittgenstein,
    title = "Rand und Wittgenstein",
    subtitle = "Versuch einer Annäherung",
    author = "Mathias {Iven}",
    year = "2004",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097736"
}