@book { WerkstattSpurenDieSonatinevonPierreBoulez,
    title = "Werkstatt-Spuren: Die Sonatine von Pierre Boulez",
    author = "Susanne {Gärtner}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1104236"
}