1. A sensitivity analysis of land degradation effects on food-crop productivity;Arifin;Ekonomi dan Keuangan Indonesia,1995
2. Human-induced soil degradation activities;van Baren;Int. Agrophys.,1998
3. Belward, A.S., Ed. (1996). The IGBP-DIS global 1 km land cover data set (DISCOVER)-Proposal and implementation plan. IGBP-DIS Working Paper No. 13. Toulouse, France, p. 61.
4. den Biggelaar, C., Lal, R., Wiebe, K.D., Breneman, V., The Global Impact of soil Erosion on Productivity. I. Absolute and relative erosion-induced yield losses. (This volume).
5. Impact of Soil Erosion on Crop Yields in North America;den Biggelaar;Adv. Agron.,2001