ORGANISATION DES NATIONS UNIES POUR L'ALIMENTATION ET L'AGRICULTURE (FAO)
2011, Report
Martin L. VAN DER SCHANS, Philippe LEMPERIERE, Jean-Paul LUC, Tania ZAMBRANA - GUEDEZ, Ingrid HERMITEAU, Hervé OUEDRAOGO
2007, Report
A. LAMBERT and J. EGG and F. GALTIER
1996, Report
A. Kaboré and A. Garba and M. Dounama Mata
1993, Report
V. CAUPIN
1996, Report
J. COSTE
1996, Report