Stays abroad

◉ GEORGIA TECH, Atlanta, from July 27 to September 10, 2005: Collaboration with Serge Guillas.

◉ Gaston Berger University of Senegal, April 2005, July 2007, July 2008, July 2009, February 2010, July 2011, July 2012, April 2013, July 2014.

◉ INREST, Quebec, Canada, March 2009, November 2014.

◉ UCAD University of Dakar, July 2009, July 2012, April 2014.

◉ University College London, August 2009, December 2014. University of Science and Technology Missouri, USA, February 2016.

◉ Lebanese University of Beirut, Lebanon, May 2017

◉ University of Beirut, Lebanon, May 2017

◉ Tokyo University ST, June 2017

◉ University of Florence, Italy, June 2017

◉ Institute of Mathematics and Physical Sciences, Cotonou, Benin, March 2018, May 2019.

◉ University of Colombia, USA, June 2018

◉ University of Malaya, Malaysia, October 2018

◉ University of Melbourne; Australia, December 2018

◉ CESAG, Dakar, Senegal, February 2019, 2023, 2024

◉ AIMS Senegal, July 2019

◉ University of Malaya, Malaysia, August 2019, 2023

◉ University College London, March 2023

◉ North West University, South Africa, Febrary 2023, 2024

◉  University college Dublin, December 2023

◉  University Catolic, Rome, Italy, November 2023, December 2024

◉  Université de Montréal, Canada, August 2024-August 2025

◉ Fields Institute, Toronto, Canada, September-December 2024