@book { SzenarioTechnikinderUnternehmensplanung,
    title = "Szenario-Technik in der Unternehmensplanung",
    author = "David {Köster}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832470753",
    url = "https://m.diplom.de/document/222394"
}