Defence date: 6 December 2004Examining board: Mercè Barceló i Serramalera, Directora externa (Universitat Autònoma de Barcelona) ; Bruno de Witte (Instituto Universitario Europeo de Florencia) ; Luciano Vandelli (Università degli Studi di Bologna) ; Jacques Ziller, Driector (Instituto Universitario Europeo de Florencia)PDF of thesis uploaded from the Library digitised archive of EUI PhD theses completed between 2013 and 201