1. OASIS-IETR, UMR CNRS 6164, Bat.11B, Campus de Beaulieu, Université de Rennes, 35042 Rennes, France
2. ED2DS, University Iba Der Thiam, BP 1039, Thies 99341, Senegal
3. LEITER, University Gaston Berger, BP 234, Nationale 2, Route de Ngallele, Saint-Louis 99341, Senegal