@book { CitizenshipandSolidarityintheEuropeanUnion,
    title = "Citizenship and Solidarity in the European Union",
    subtitle = "From the Charter of Fundamental Rights to the Crisis, the State of the Art",
    author = "Alessandra {Silveira} and Mariana {Canotilho} and Pedro {Madeira Froufe}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    doi = "10.3726/978-3-0352-6385-5",
    url = "https://www.peterlang.com/document/1053775"
}