@book { SicherheitsaspekteinITNetzwerken,
    title = "Sicherheitsaspekte in IT-Netzwerken",
    author = "Jan {Wirsam}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832458331",
    url = "https://m.diplom.de/document/221299"
}