@book { DemografischerWandelinRheinlandPfalz,
    title = "Demografischer Wandel in Rheinland-Pfalz",
    author = "Bernd von {Hoffmann} and Gerhard {Robbers}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1108304"
}