@book { PensionsverpflichtungennachInternationalAccountingStandards,
    title = "Pensionsverpflichtungen nach International Accounting Standards",
    author = "Stefan {Rössler}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832435639",
    url = "https://m.diplom.de/document/219224"
}