Hall, Bronwyn H <br/><br/>
Technology entry in the presence of patent thickets / 
Bronwyn H. Hall, Christian Helmers and Georg von Graevenitz 
 - Cambridge  NBER  2015 
 - 50p 
 - NBER Working Paper ;  21455 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>NBERWP 21455<br/>E15288.pdf