@book { BrgerinformationimInternet,
    title = "Bürgerinformation im Internet",
    author = "Frank {Falkenstein}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832409739",
    url = "https://m.diplom.de/document/216871"
}