@book { CorporateDesignundSystemtheorie,
    title = "Corporate Design und Systemtheorie",
    author = "Henrik {Johannsen}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832480790",
    url = "https://m.diplom.de/document/223307"
}