Experimental study of potential evapotranspiration (PET) in Central Africa /Riou, Charles EVAPOTRANSPIRATION POTENTIELLE HERBACEE BILAN HYDRIQUE LYSIMETRIE FORMULE DE PENMAN 1984 text https://www.documentation.ird.fr/hor/fdi:41589 fdi:41589 Riou Charles. Experimental study of potential evapotranspiration (PET) in Central Africa. 1984, 72, 275-288 EN AFRIQUE CENTRALE TCHAD CENTRAFRICAINE REPUBLIQUE CONGO ZONE ARIDE ZONE EQUATORIALE ZONE SAHELIENNE ZONE TROPICALE HUMIDE