@book { PremireundDeuximeSonatevonPierreBoulez,
    title = "«Première» und «Deuxième Sonate» von Pierre Boulez",
    author = "Barbara {Dobretsberger}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1098993"
}