Akramkhanov, A. 2005. The spatial distribution of soil salinity: detection and prediction. Ph.D. Thesis. Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany. Ecology and Development Series No. 32. Cuvillier Verlag Göttingen. (http://www.zef.de/serieszefc.0.html)

Rudenko I. (2008): Value chains for rural and regional development: The case of cotton, wheat, fruit and vegetable value chains in the lower reaches of the Amu Darya River, Uzbekistan. Wirtschaftswissenschaften (Economy), Hannover, ZEF Bonn / Gottfried Wilhelm Leibniz Universität Hannover. 235 p.

Ibrakhimov, M. 2005. Spatial and temporal dynamics of groundwater table and salinity in Khorezm (Aral Sea Basin), Uzbekistan. Ph.D. Univ. Bonn. ZEF Series in Ecology and Development, 23. 175 pp.