@book { BlueOceanStrategie,
    title = "Blue-Ocean-Strategie ",
    author = "Michael {Konter}",
    year = "2012",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656188063",
    url = "https://www.hausarbeiten.de/document/193699"
}