@book { RentenkriseinDeutschlandundWegezurLsung,
    title = "Rentenkrise in Deutschland und Wege zur Lösung",
    author = "Helena {Trastschinski}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832470425",
    url = "https://m.diplom.de/document/222364"
}