@book { FinanztheoretischeAnalysederAlterssicherung,
    title = "Finanztheoretische Analyse der Alterssicherung",
    author = "Ulrich {Schacht}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1092070"
}