L. R. Oldeman, R. T. A. Hakkeling, and W. G. Sombroek, “World map of the status of human induced soil degradation: An explanatory note,” ISRIC/UNEP, Wageningen, The Netherlands, 1991.
H. Dregne, M. Kassas, and B. Rozanov, “Status of deserti- fication and implementation of United Nations plan to combat desertification,” Desertification Control Bulletin, No. 20, pp. 6, 1991.
C. de Haan, H. Steinfeld, and H. Blackburn, “Livestock and the Environment: Finding a balance,” Study sponsored by the European Commission, FAO and World Bank, 1997.
I. Scoones, (Ed.) “Living under uncertainty: New directions in pastoral development in Africa,” Intermediate Techno- logy Publications, London, 1994.
T. Amede, et al., “Maximizing benefits from livestock- water venture in Sub-Saharan Africa: From concepts to practices,” The International Water Management Institute/ International Livestock Research Institute, Addis Ababa, Ethiopia, 2009.
A. K. Acharya and N. Kafle, “Land degradation issues in Nepal and its management: Through agroforestry,” The Journal of Agriculture and Environment, Vol. 10, June 2009.
A. de Sherbinin, “CIESIN thematic guide to land-use and land-cover change,” Center for International Earth Science Information Network (CIESIN), Columbia University, Palisades, NY, USA, 2002.
G. B. Thapa and G. S. Paudel, “Evaluation of the livestock carrying capacity of land: Resources in the Hills of Nepal based on total digestive nutrient analysis,” Agriculture, Ecosystems & Environment, Vol. 78, No. 3, pp. 223–235, May 2000.
D. G. Wilcox and J. F. Thomas, “The Fitzroy valley regeneration project in Western Australia,” in J. A. Dixon, D. E. James and P. B. Sherman, Eds., “Dry management: Economic case studies,” Earthscan Publications Ltd., London, 1990.
L. C. Braat and J. B. Opschoor, “Risk in the Botswana range-cattle system,” in J. A. Dixon, D. E. James and P. B. Sherman, Eds., “Dry management: Economic case studies,” Earthscan Publications Ltd., London 1990.
C. Berrings and D. I. Stern, “Modelling loss of resilience in agroecosystems: Rangelands in Botswana,” Environ- mental and Resource Economics, Vol. 16, No. 12, pp. 185–210, 2000.
D. Pearce, E. Barbier, and A. Markandya, “Sustainable development: Economics and environment in the Third World,” Edward Elgar, England, 1990.
A. R. Gigengack, C. J. Jepma, D. MacRae, and F. Poldy, “Global modelling of dryland degradation,” in J. A. Dixon, D. E. James and P. B. Sherman, Eds., “Dry management: Economic case studies,” Earthscan Publications Ltd., Lon-don, 1990.
H. A. Simon, “Causal ordering and identifiability,” in W. C. Hood and T. C. Koopmans, Eds., “Studies in econometric method,” Cowles Foundation Monograph, No. 14, Yale University Press, New Haven, 1953.
E. Abdelgalil, “Economic policies for sustainable resource development: Models applied to Sudan,” PhD thesis, Eras-mus University Rotterdam, The Netherlands, 2000.
M. Fafchamps, “The tragedy of the commons, livestock cycles, and sustainability,” Journal of African Economies, Vol. 7, No. 3, pp. 384–423, 1998.
J. Ellis, “Climate variability and complex ecosystem dy-namics: Implications for pastoral development,” in I. Scoones, Ed., “Living under uncertainty: New directions in pastoral development in Africa,” Intermediate Technology Publications, London, 1994.
R. Ramcharan, “Money, meat, and inflation: Using price data to understand an export shock in Sudan,” IMF Working Paper WP/02/84, 2002.
R. H. Behnke, I. Scoones, and C. Kerwin, “Range Eco- logy at Disequilibrium,” ODI, London, UK, 1993.