Kortum, Samuel <br/><br/>
Stronger protection or technological revolution: What is behind the recent surge in patenting? 

 - Cambridge, MA  NBER  1997 
 - 57 + figs. 
 - Working Paper Series .
<br/><br/><label>ISBN: </label>
<br/><br/><label>Dewey Class. No.: </label>6104