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关注：1
2013-05-23 12:21
求翻译：differences ( Pakes, 1986; Yi, 2007 ) and technical field differences (Grönqvist, 2009; Pakes, 1986; Yi, 2007). For this purpose, corresponding dummy variables denoting the typical country and the technology field are introduced in the pooled patent data. For是什么意思？ 待解决
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differences ( Pakes, 1986; Yi, 2007 ) and technical field differences (Grönqvist, 2009; Pakes, 1986; Yi, 2007). For this purpose, corresponding dummy variables denoting the typical country and the technology field are introduced in the pooled patent data. For
问题补充： |
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