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- June 1994: •University of Portsmouth, United Kingdom.
- May 1996: •University of Malaga, in Torremolinos, Spain.
- May-June 1998: •Université Laval, Quebec City, Canada.
- May-June 2000: •University of Economics in Katowice, Beskidy Mountains, Poland.
- June 2002: •Nara, Japan.
- April 2004: •University of Tunis in Hammamet, Tunisia.
- June 2006: •The Loire Valley, City of Tours, France
- September 2008: •University of Portsmouth, United Kingdom
- May 2010: •University of Sfax, Tunisia.
- June 2012: •The Canadian Operational Research Society, city of Niagara Falls, Canada
- December 2015: •Tlemcen University, Algeria
- October 2017: •Metz, France
- October 2019: •Marrakech, Morocco
- December 2021: Sophia Antipolis, France
- October 2023: İzmir, Türkiye