@book { DiePoesiederLiebe,
    title = "Die Poesie der Liebe",
    subtitle = "Aufsätze zur deutschen Liebeslyrik",
    author = "Ulrich {Kittstein}",
    year = "2006",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1100811"
}