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journal of economic growth
  
سال:2014 - دوره:19 - شماره:2
  
 
Sequential R&D and blocking patents in the dynamics of growth
- صفحه:183-219
  
 
The democratic transition
- صفحه:141-181
  
 
Violence and economic activity: evidence from African American patents, 1870–1940
- صفحه:221-257
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