Hess, E H <br/><br/>
Pupil Size in Relation to Mental Activity during Simple Problem-Solving.  [electronic resource] 

 -  Science (New York, N.Y.)  Mar 1964 
 - 1190-2 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0036-8075 
<br/><br/><label>Standard No.: </label>10.1126/science.143.3611.1190  doi