@book { LeanSixSigmabeiFinanzdienstleistern,
    title = "Lean Six Sigma bei Finanzdienstleistern",
    author = "Roland {Schurig}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Germany",
    doi = "10.3239/9783836647458",
    url = "https://m.diplom.de/document/227810"
}