8Park A. Household grain management under uncertainty in America ]-D~ . Stanford: Stanford University, 2006.
9Bouis H E. A food demand system based on demand for characteristics: If there is"Curvature" in the Slutsky ma- trix, What Do the Curves I.ook Like and Why? ~J~. Journal of Development Economics, 2006 (6) : 239-266.
10Holden S, Shiferaw B . Land degradation, drought and food security in a less-favoured area in the Ethiopian high- lands: a hio-economic model with market imperfections ~J~ . Agricultural Economics, 2008 (12).. 31 49.