@book { PrognosederWahrscheinlichkeitvonKundenabwanderungen,
    title = "Prognose der Wahrscheinlichkeit von Kundenabwanderungen",
    author = "Christian {Schnider}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832495398",
    url = "https://m.diplom.de/document/224665"
}