@book { KeyAccountManagementimInvestitionsgterbereich,
    title = "Key Account Management im Investitionsgüterbereich",
    author = "Toby {Kurumundayil}",
    year = "2005",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832486747",
    url = "https://m.diplom.de/document/223651"
}