Stati Uniti
California - Los Angeles - October 1999
Sati Uniti
California - San Francisco - October 1999
Londra (UK)
July 2000
ESSLLI 2000 - Birmingham(UK)
August 2000
CAV 2001 - Paris(France)
July 2001
SHAMIR 2002 with Eli Shamir and Moshe Vardi - Neve Ilan (Israel)
May 2002
JELIA 2002 - Cosenza(Italy)
September 2002
