@book { KeyAccountManagementEineAnalysevonControllingInstrumenten,
    title = "Key-Account-Management. Eine Analyse von Controlling-Instrumenten",
    author = "Ivan {Konovalov}",
    year = "2017",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/373615"
}