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2. A parametric crop water use model;Burt;Water. Res. Res.,1981
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4. Hounam , C. E. Burgos , J. J. Kalik , M. S. Palmer , W. C. Rodda , J. 1975 Drought and agriculture W.M.O. Tech. Note No. 138
5. Lawson , M. P. Reiss , A. Phillips , R. Livingstone , K. 1971 Nebraska droughts: a study of their past chronological and spatial extent with implications for the future Occasional Paper No. 1, Dept. of Geography, University of Nebraska