American Scientist 82 

 - New York  Sigma  Jul./ Ago. 1994 
 - 400 
 - 20100310 
 - American Scientist  82 .
<br/><br/><label>ISSN: </label>1679-656X 
<br/><br/><label>Dewey Class. No.: </label>AMS 2010  / 2010