search query: @freeterm porter hypothesis / total: 2
references: 1-2 / 2
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1.
Journal of Environmental Economics and Management
2008 : NOV, VOL. 56:3 p. 246-259
2008 Greaker M.,
Rosendahl K. E.,
2.
Journal of Environmental Management
2005 : OCT, VOL. 77:2, p. 104-110
2005 Lee, M.
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