@book { SichereITKommunikationberunsichereNetze,
    title = "Sichere IT-Kommunikation über unsichere Netze",
    author = "Shubhangi {Stark}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832445003",
    url = "https://m.diplom.de/document/220101"
}