@book { DieNATOTransformationAufgabenZiele,
    title = "Die NATO – Transformation, Aufgaben, Ziele",
    author = "Gunther {Hauser}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1105004"
}