Defence date: 23 June 1988Examining Board: Prof. Athanasios Moulakis (I.U.E. e Harvard University, supervisor) ; Prof. Margherita Isnardi-Parente (Università di Roma) ; Prof. Francesco Adorno (Università di Firenze) ; Prof. Gisela Bock (I.U.E.)PDF of thesis uploaded from the Library digitised archive of EUI PhD theses completed between 2013 and 201