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First Author:
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| François Seck Fall |
| Lereps, University of Toulouse 2 Jean Jaurès |
| francois.fall@univ-tlse2.fr |
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Second Author:
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| Philippe Jean-Amans |
| Lereps, University of Toulouse 2 Jean Jaurès |
| philippe.jean-amans@univ-tlse2.fr |
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Third Author:
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| Harouna Wassongma |
| University of Ouahigouya-UOHG |
| wassongmah@yahoo.fr |
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