@book { VirtualisierteDMZaufXenBasis,
    title = "Virtualisierte DMZ auf Xen Basis",
    author = "René {Karcher}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836611992",
    url = "https://m.diplom.de/document/229107"
}