Delkvist, Jan. <br/><br/>
A comparison between difference and ratio production of darkness. 

 - Stockholm :  University of Stockholm,  1972. 
 - Stockholm. University. Psychological Laboratories. Report ;  no. 356 .
 - Stockholms universitet. Psychological Laboratories. Report ;  Stockholms universitet. Psychological Laboratories. Report ;  Stockholms universitet. Psychological Laboratories. Report ;  no. 356 .
<br/><br/> Cover-title. 
<br/><br/>Bibliography: p. 9. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Psychometrics.<br/>Judgment.<br/>Visual discrimination.<br/>Perception.