Kass, Leon R. <br/><br/>
El derecho de patente. 

 - Washington-XXU :   International Communicational Agency United States of America,   1982. 
 - p. 42-48 :   il. 
 - Trimestral 
 - No. 58(1982).  
 - Facetas ;   No. 58 .
 - International Communicational Agency United States of America. .
<br/><br/><br/>Espaņol.