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Journal of Environmental Management > 2009 > 90 > 5 > 1862-1867
Journal of Environmental Economics and Management > 2001 > 41 > 1 > 33-43
Journal of Environmental Management > 2009 > 90 > 5 > 1862-1867
Journal of Environmental Economics and Management > 2001 > 41 > 1 > 33-43