Sorsa, Veikko <br/><br/>
The Quadripolar Spindle and the Change of Orientation of the Chromosomes in Meiosis of Sphagnum 

 - Helsinki :   Suomalainen Tiedeakatemia,   1956. 
 - 64 p. :   il. ;   18 cm. 
 - Annales Academiae Scientiarum Fennicae. Serie A. IV. Biológica ;   33 .