Kerr, Sari Pekkala <br/><br/>
Global collaborative patents / 
Sari Pekkala Kerr and William R. Kerr 
 - Cambridge  NBER  2015 
 - 62p 
 - NBER Working Paper ;  21735 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>NBERWP 21735<br/>E16106.pdf