Chemical and engineering news 

 - WASHINGTON, d.c. :  AMERICAN CHEMICAL SOCIETY (ACS), 
 - Semanal 
<br/><br/><label>ISSN: </label>0009-2347 
 = Chemical and engineering news 
 = CHEM. ENG. NEWS 
<br/><br/><label>Subjects--Index Terms: </label>INGENIERIA QUIMICA