@book { InnovationscooperationzwischenHerstellerundAnwender,
    title = "Innovationscooperation zwischen Hersteller und Anwender",
    author = "Olaf-Heye {Heyenga}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832401948",
    url = "https://m.diplom.de/document/216144"
}