@book { DeterminantenregionalerAltersstrukturdifferenzeninBayern,
    title = "Determinanten regionaler Altersstrukturdifferenzen in Bayern",
    subtitle = "Eine sozio-demographische Analyse",
    author = "Andreas {Heigl}",
    year = "1998",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1086329"
}