@book { SituativerEinsatzderBlueOceanStrategy,
    title = "Situativer Einsatz der Blue Ocean Strategy",
    author = "Stefan {Krulis}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836632812",
    url = "https://m.diplom.de/document/227038"
}