@book { FinanzierungderAltersversorgungdesffentlichenDienstes,
    title = "Finanzierung der Altersversorgung des öffentlichen Dienstes",
    author = "Klaus {Heubeck} and Bert {Rürup}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13832",
    url = "https://www.peterlang.com/document/1068407"
}