@book { ConceptodeSoberanaenelordenInternacional,
    title = "Concepto de Soberanía en el orden Internacional",
    author = "Oliver {Gust}",
    year = "2007",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638604512",
    url = "https://www.hausarbeiten.de/document/67676"
}