Frazier, T W <br/><br/>
Circadian variability in vigilance performance.  [electronic resource] 

 -  Aerospace medicine  Apr 1968 
 - 383-5 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0001-9402 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adult<br/>Attention<br/>Circadian Rhythm<br/>Environment<br/>Humans<br/>Male