@book { AltwerdeninderHeimatundinDeutschland,
    title = "Altwerden in der Heimat und in Deutschland",
    author = "Gerda {Blechner}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1086420"
}