@book { CavalleriarusticanaundPagliacci,
    title = "«Cavalleria rusticana» und «Pagliacci»",
    author = "Sabine {Brettenthaler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1094124"
}