@book { DasneueNATOKonzeptinderFeuerprobeAfghanistan,
    title = "Das neue NATO-Konzept in der Feuerprobe Afghanistan",
    author = "Jens {Engel}",
    year = "2008",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640214839",
    url = "https://www.hausarbeiten.de/document/118338"
}