@book { DigitaleDistributionklassischerMusik,
    title = "Digitale Distribution klassischer Musik",
    author = "Katrin {Haase}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640812998",
    url = "https://www.hausarbeiten.de/document/165118"
}