@book { TroubadourderFreiheit,
    title = "Troubadour der Freiheit",
    subtitle = "Geschichte der politischen Lyrik in der Schweiz 1830-1848",
    author = "Jürg {Frey}",
    year = "1994",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1116852"
}