@book { ClemensBrentanosLyrikanLuiseHensel,
    title = "Clemens Brentanos Lyrik an Luise Hensel",
    author = "Kristina {Hasenpflug}",
    year = "1999",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1087173"
}