@book { LaFranchiseenFrance,
    title = "La Franchise en France",
    author = "Johannes {Steyrer}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832451363",
    url = "https://m.diplom.de/document/220663"
}