@book { ErinnerunganWittgenstein,
    title = "Erinnerung an Wittgenstein",
    subtitle = "«kein Sehen in die Vergangenheit»?",
    author = "Wilhelm {Lütterfelds}",
    year = "2004",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097248"
}