1. The costs of land degradation in Sub-Saharan Africa;Bojö;Ecol. Econom.,1996
2. The Conditions of Agricultural Growth: The Economics of Agrarian Change Under Population Pressure;Boserup,1965
3. Cleaver, K.M., Schreiber, G.A., 1994. Reversing the Spiral, the Population, Agriculture and Environment Nexus in sub-Saharan Africa. The World Bank, Washington, DC, 293 pp.
4. Diels, J., Aihou, K., Iwuafor, E.N.O., Singh, U., Merckx, R., Lyasse, O., Sanginga, N., Vanlauwe, B., Deckers, J., 2001. Options for organic C maintenance under intensive cropping in the West African savanna. In: B Vanlauwe, J Diels, N Sanginga and R Merckx (Eds.). Integrated nutrient management in sub-Saharan Africa: from concept to practice. 20001. CABI, Wallingford, UK, In Press.
5. Donovan, G., Casey, F., 1998. Soil fertility management in sub-Saharan Africa. World Bank Technical Paper No. 408. The World Bank, Washington, DC, 60 pp.