@book { VertragsrechtlicheFragendesCloudComputing,
    title = "Vertragsrechtliche Fragen des  Cloud Computing",
    author = "Stefan {Lutz}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640924738",
    url = "https://www.hausarbeiten.de/document/172523"
}