@book { TheorieundEmpiriederAlterssicherunginDeutschland,
    title = "Theorie und Empirie der Alterssicherung in Deutschland",
    author = "Jörg {Schoder}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13559",
    url = "https://www.peterlang.com/document/1068162"
}