@book { ManaginganAgeingWorkforce,
    title = "Managing an Ageing Workforce",
    subtitle = "The Impact of an Ageing Population on the German Labour Market and how Employers can deal with related Challenges",
    author = "Daniel {Smentek}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832499044",
    url = "https://m.diplom.de/document/225021"
}