@book { LEtatsocialactif,
    title = "L'Etat social actif",
    author = "Pascale {Vielle} and Philippe {Pochet} and Isabelle {Cassiers}",
    year = "2006",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    url = "https://www.peterlang.com/document/1100709"
}