Näätänen, Esko K. <br/><br/>
The Combined Effect of Percorten and Psychic Stress on the Spermatogenesis of Rats 

 - Helsinki :   Suomalainen Tiedeakatemia,   1955. 
 - 8 p. :   8 figs. ;   18 cm. 
 - Annales Academiae Scientiarum Fennicae. Serie A. V. Medica-Anthropologica ;   52 .