@book { AUnitedStatesofEurope,
    title = "A United States of Europe?",
    author = "Cesáreo {Rodríguez-Aguilera de Prat}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    doi = "10.3726/b17313",
    url = "https://www.peterlang.com/document/1063570"
}