@book { DieInternationalisierungvonInternetportalen,
    title = "Die Internationalisierung von Internetportalen",
    author = "Torsten {Hoffmann}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832446512",
    url = "https://m.diplom.de/document/220261"
}