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Bulletin of Latin American Research > 31 > 3 > 336 - 351
International Journal of Educational Research > 2012 > 55 > Complete > 16-25
Biodiversity and Conservation > 2009 > 18 > 10 > 2585-2600
Ecological Economics > 2006 > 59 > 4 > 406-418
World Development > 2001 > 29 > 8 > 1391-1404