@book { AEuropeanSocialCitizenship,
    title = "A European Social Citizenship?",
    author = "Lars {Magnusson} and Bo {Stråth}",
    year = "2004",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    url = "https://www.peterlang.com/document/1097032"
}