Proceedings of the National Academy of Sciences 

 - Washington :  The National Academy of Sciences 
 - v. 
 - Mensual 
<br/><br/> CAICYT  ISSN 
<br/><br/><label>ISSN: </label>0027-8424 
<br/><br/><label>Standard No.: </label>RELAP00026 
<br/><br/><label>Universal Decimal Class. No.: </label>505 Dewey