@book { ModernesStdtemanagementOpenInnovationimffentlichenSektor,
    title = "Modernes Städtemanagement. Open Innovation im öffentlichen Sektor",
    author = "Ömer  {Aslantas} and Tim {Huber}",
    year = "2015",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/304604"
}