1- Scheinfinger, H.Kromp-Koib,H,2000.Modeling. Global radiation in complex terrain compring: two Statistical approachecs.agric. for meteorol.
2- Valk.p.1970 radiation load on building of different shape and orientation under various climatic conditions.
3- Amarakoon.D.Chen,A,1999.estimating daylight net radiance. Solar energy.
4- Dehne.K.,1984 Diffuse Solar radiation measured by the shade ring method
improved by a correction formula in: instruments and observing methods.WMO.
5- Climate. drought and desertification.wmo-no 869-1997.
6- Djitey.M.A 1985-Vegetation in Semi-arid regions.
7- Hare.F.K.1983-Climate and desertification. A revised analysis VCP,44 WMO.149pp.
8- WMO.1975 drought and agriculture wmo technical note 138.
9- Handerson. Sellers and MC Gaffie.K.,1997 A climate modeling primer,John willey & sony.
10- Bobee. Band F. Ashkar.1991.the gamma family and derived distributions applied in hydrology.WRP.USA.
11- IPCC First assessment report.1992 Climatic change: the 1990 and 1992 IPCC assessment (Working group I: Scientific assessment of Cilmatic. change).wmo UNEP
12- Patterson.D.T 1995.Weeds in changing climate. weed 43:685-701
13- Rawligs.S.I 1991 Global environmental Change and agriculture.J.prod. agric.4:291-293.
14- Delcourt.G.G.C.Van kooten 1995.How resilent. Is Grain production to climatic change? Sustainable agriculture in a dryland cropping region of western Canada. Journal of Sustainable. agriculture.Vol:5(3)37-5.