@book { KontextproblemederLyrikClemensBrentanos,
    title = "Kontextprobleme der Lyrik Clemens Brentanos",
    author = "Ursula {Matthias}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1071935"
}