1. CIMPA-UNSA-UNESCO School : University of Yaoundé I - Cameroon, 02 - 08 July 2000. "Computer tools in complex dynamics systems researches ".
2. International Congress of Mathematicians (ICM 2006), Madrid - Spain, 22-30 august 2006.
3. First edition of Brazil-Benin school on Optimization : University of Abomey- Calavi, Ouidah - Benin, September 3-22, 2007.
4. International Symposium : Mathematics and Applications, Honour to Professor Joël MOULEN, University of Yaounde I, Cameroon : June 19-21, 2007.
5. Workshop Logic, Rationality and Interaction (LORI), du 5 au 9 Août 2007, Beijing, China.
6. Huitième conférence sur la Logique et la fondation de la théorie des jeux et de la théorie de la décision. Université d'Amsterdam, Institut de Logique, Langage et Programmation : du 3 au 5 Juillet 2008.
7. First conference on Mathematics, University de Buea, Cameroun : May 12-16, 2009.
8. ADRES Colloquium, Honour to Professor Maurice Salles, University of Caen Basse Normandie, France, June 10-12, 2009.
9. APSA (American Political Sciences Association) "Workshop" at Accra (Ghana) on the theme: " Elections and democracy " : from june 21, to july 10, 2009.
10. Applied Economics seminar, University of Bilbao - Spain, Department of Economic, November 27, 2009.
11. Game theory seminar : "Universitat Politécnica Catalunya" de Manresa, Espagne. May 25, 2010.
12. School on operational research: University of Abomey-Calavi, Porto-novo, Benin, November 7-13, 2011.
13. Workshop on Coalitions and Networks : Concordia University, Canada, May 16-17, 2014.