@book { OpenInnovationWahlfreiheitvsVertragszwang,
    title = "Open Innovation. Wahlfreiheit vs. Vertragszwang",
    author = "",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656558446",
    url = "https://www.hausarbeiten.de/document/266092"
}