@book { VonVerteidigungzukollektiverSicherheit,
    title = "Von Verteidigung zu kollektiver Sicherheit",
    author = "Gunter {Warg}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097094"
}