@book { DerVergleichderInvalidittsrenteninDeutschlandunddenNiederlanden,
    title = "Der Vergleich der Invaliditätsrenten in Deutschland und den Niederlanden",
    author = "Petra {Knorr}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1101715"
}