@book { SmtlicheWerkein27Bnden,
    title = "Sämtliche Werke in 27 Bänden",
    author = "Friedrich {Hebbel}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1069231"
}