Covid-19 outbreak and stocks return on the West African Economic andMonetary Union's stock market:An empirical analysis of the relationship through the event study approachTibi Didier ZOUNGRANA , Daouda Lawa Tan TOE , Mamadou TOEÀ réviserHealth and environmental consciousness effects of wealth in low income countries: evidence from households energy, water, and sanitation services consumption in Burkina FasoIbrahim Niankara, Tibi Didier Zoungrana, Rachidatou Ingrid TraoretÀ réviserThe effect of wealth on the choice of household drinking water sources in West AfricaTibi Didier ZoungranaÀ réviserAnalysis of the Determinants of the Technical Efficiency of Horticultural Production in the Face of the Degradation of Water Reservoirs in Urban Centers in Burkina FasoOlivier Combelem, Tibi Didier Zoungrana, S. Yonkeu |