@book { IsKosovoastateininternationallegalterms,
    title = "Is Kosovo a state in international legal terms? ",
    author = "Natalie {Züfle}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656027126",
    url = "https://www.hausarbeiten.de/document/180099"
}