@book { ValrySaussurien,
    title = "Valéry Saussurien",
    subtitle = "Zur linguistischen Fragestellung bei Paul Valéry",
    author = "Peter {Wunderli}",
    year = "1977",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1070241"
}