@book { OpenInnovationinB2BUnternehmen,
    title = "Open Innovation in B2B-Unternehmen",
    author = "Stefan {Prandl}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656569244",
    url = "https://www.hausarbeiten.de/document/265324"
}