@book { DieprivateMilitrbrancheprivatizedpeacekeeping,
    title = "Die private Militärbranche - privatized peace-keeping?",
    author = "",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640885831",
    url = "https://www.hausarbeiten.de/document/170006"
}