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Sun, Laixiang and Albersen, P (2001) 'Land Degradation as a Transformation Process in an Intertemporal Welfare Optimization Framework.' In: Heerink, Nico, van Keulen, H. and Kuiper, Marijke, (eds.), Economic Policy and Sustainable Land Use: Recent Advances in Quantitative Analysis for Developing Countries. Heidelberg: Springer Physika-Verlag, pp. 59-72.