Defence date: 12 December 1988
Examining board: Prof. Mario Nuti (E.U.I., Supervisor) ; Prof. Wlodzimierz Brus, Wolfson College, Oxford ; Prof. Benedetto Gui, University of Trieste ; Prof. Marie Lavigne, University of Paris I ; Prof. Ales Vahcic, ICPE. Llubjana and University of Llubjana