共 32 条
- [21] Markowitz, Portfolio selection, (1970)
- [22] Agricultural Statistics Bulletin, 3, (1984)
- [23] Handbook of Sudan Energy, (1987)
- [24] Ryan, Supply response to risk: the case of U.S. pinto beans, West. J. Agric. Econ., 4, pp. 83-87, (1977)
- [25] Simpson, Alternative strategies for agricultural development in the central rainlands of the Sudan with special reference to Damazin area, (1978)
- [26] Thimm, Development projects in the Sudan: an analysis of their reports with implications for research and training in arid land management, (1979)
- [27] Trail, Risk Variables in Econometric supply Response Models, Journal of Agricultural Economics, 29, pp. 53-61, (1978)
- [28] Tronstad, McNeill, Asymmetric Price Risk: An Econometric Analysis of Aggregate Sow Farrowings, 1973-86, American Journal of Agricultural Economics, 71, pp. 630-637, (1989)
- [29] Whitney, Impact of fuelwood use on environmental degradation in the Sudan, Lands at Risk in the Third World, (1987)
- [30] Wilson, Arther, Whittaker, An attempt to account for risk in an Aggregate Wheat Acreage Response Model, Canadian Journal of Agricultural Economics/Revue canadienne d'agroeconomie, 28, pp. 63-71, (1980)