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出 处:International Journal of Economic Sciences and Applied Research. 2013 ;6(1):59-73.
出 版 社:Kavala Institute of Technology
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出 版 社:International Society for Development and Sustainability (ISDS)
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出 处:Journal of Economics and Sustainable Development. 2013 ;4(3):236-245.
出 版 社:The International Institute for Science, Technology and Education (IISTE)
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