@book { KeyAccountManagementinRealisation,
    title = "Key Account Management in Realisation",
    author = "Jörg {Wilmink}",
    year = "2004",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638295109",
    url = "https://www.hausarbeiten.de/document/27468"
}