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Social Indicators Research > 2010 > 98 > 2 > 301-319
World Development > 2008 > 36 > 6 > 992-1010
IEEE Computer Graphics and Applications > 2008 > 28 > 3 > 99 - 103
World Development > 2000 > 28 > 2 > 197-219
World Development > 1998 > 26 > 4 > 659-672