1. Acharya, G., Barbier, E.B., 1998. Valuing environmental functions using domestic water demand analysis. Paper presented at the World Congress of Environmental and Resource Economists, June 25–27, 1998 Venice, Italy.
2. Acharya, G. Barbier, E.B., 2000. Valuing groundwater recharge through agricultural production in the Hadejia-Nguru wetlands in northern Nigeria. Agric. Econ. 22(3), 247–259.
3. Acharya, G., 1998. Hydrological-Economic Linkages in Water Resource Management. Unpublished PhD dissertation, University of York.
4. Adams, W.M., Hollis, G.E., 1988. Hydrology and sustainable resource development of a Sahelian floodplain wetland. Unpublished manuscript, Report for the Hadejia-Nguru Wetlands Conservation Project.
5. Agriculture, grazing and forestry;Adams,1993