@book { DemografischerWandelinDeutschland,
    title = "Demografischer Wandel in Deutschland",
    author = "Franziska {Bothe}",
    year = "2012",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656211389",
    url = "https://www.hausarbeiten.de/document/195339"
}