1. The social ecology of soil erosion in Colombian farming system;Ashby;Rural Sociology,1985
2. Aune, J.B., Lal, R., 1995. The tropical soil productivity calculator: a model for assessing effects of soil management on productivity. In: Lal (Ed.), Soil Erosion Research Methods, 2nd Edition, SWCS, Ankeny, Iowa, pp. 1–9.
3. Aune, J.B., 1994. Prediction of soil degradation in Tanzania—a system analysis approach. Center for environment and development studies, Agricultural University of Norway.
4. The impact of macroeconomic policies on the management of land resources in Tanzania;Bagachwa;Norwegian Journal of Agricultural Sciences, Suppl.,,1994
5. Modelling technology adoption in developing countries;Besley;American Economic Review,1993