@book { PublicOpiniononEuropeanSecurityandDefense,
    title = "Public Opinion on European Security and Defense",
    author = "Franz {Kernic} and Jean M. {Callaghan} and Philippe {Manigart}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093729"
}