I Symposium, 1971: Mexico City, Mexico

II Symposium, 1973: Cordoba, Argentina

III Symposium, 1977: Tel Aviv, Israel

IV Symposium, 1979: Toledo, Ohio, USA

V Symposium, 1982: Rio de Janeiro, Brazil

VI Symposium, 1984: Lisboa, Portugal

VII Symposium, 1986: Bruxelles, Belgium

VIII Symposium, 1988: Rome, Italy

IX Symposium, 1990: Nancy, France

X Symposium, 1991: Toronto, Canada

XI Symposium, 1993: Barcelona, Spain

XII Symposium, 1995: Thessalonica, Greece

XIII Symposium, 1996: San José, Costa Rica

XIV Symposium, 1997: Beijing, China

XV Symposium, 2000: Kyoto, Japa

XVI Symposium; 2001: Sun City, South Africa

XVII Symposium, 2002: Timisoara, Romania

XVIII Symposium, 2005: Belgrade, Serbia and Montenegro

XIX Symposium, 2007: Budapest, Hungar

XX Symposium, 2008: Timisoara, Romania

XXI Symposium, 2010: Taormina-Messina, Italy

XXII Symposium, 2012: São Paulo, Brazil

XXIII Symposium, 2013: Niigata, Japan

XXIV Symposium, 2015: Istanbul, Turkey

XXV Symposium, 2017: Xi'an, China

XXVI Symposium, 2018: Prague, Czech Republic