ProQuest <br/><br/>
ProQuest science journals Vol:PSJ_00_172 / 
ProQuest. 
 -  ProQuest Information and Learning,  2004. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>717761954830172 
<br/><br/><label>Dewey Class. No.: </label>500 PRO