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[1]Moussa I, Laurent T. Indirect and feedback effects as measure of knowledge spillovers in French regions[J]. Applied Economics Letters, 2015 (ahead-of-print): 1-4.http://www.tandfonline.com/doi/abs/10.1080/13504851.2014.950788
[2]Autant-Bernard C. The geography of knowledge spillovers and technological proximity[J]. Economics of Innovation and New Technology, 2001, 10(4): 237-254.
http://www.tandfonline.com/doi/abs/10.1080/10438590100000010
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http://www.tandfonline.com/doi/abs/10.1080/13504851.2014.950788[/backcolor]