@book { PortfolioInsuranceKonzeptefrprivateWertpapierportfolioszurAltersvorsorge,
    title = "Portfolio-Insurance-Konzepte für private Wertpapierportfolios zur Altersvorsorge",
    author = "Jens {Rullen}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832478902",
    url = "https://m.diplom.de/document/223143"
}