@book { Handelsmarkenpolitik,
    title = "Handelsmarkenpolitik",
    subtitle = "Ein Überblick",
    author = "Freddy {Buhl}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832412388",
    url = "https://m.diplom.de/document/217153"
}