This is an abridged and revised version of the paper presented to GERPISA Conference in Turin, 2008. Published article can be found at: http://www.emeraldinsight.com/ Copyright Emerald Group Publishing
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机译:这是提交给2008年都灵GERPISA会议的论文的节略版和修订版。已发布的文章可以在以下网站找到:http://www.emeraldinsight.com/版权所有Emerald Group Publishing
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