@book { DieErfassungservicebezogenerKundenanforderungen,
    title = "Die Erfassung servicebezogener Kundenanforderungen",
    author = "Petra {Braun}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832434748",
    url = "https://m.diplom.de/document/219140"
}