Scientific American 268 

 - New York  Sciam  Abr. 1993 
 - 96 
 - 20100701 
 - Scientific American  268 .
<br/><br/><label>ISSN: </label>1679-656X 
<br/><br/><label>Dewey Class. No.: </label>SAM 2010  / 2010