Niskanen, E. <br/><br/>
Some Remarks on the Geoidal Undulations and Theory of Plasticity 

 - Helsinki :   Suomalainen Tiedeakatemia,   1953. 
 - 18 p. ;   18 cm. 
 - Annales Academiae Scientiarum Fennicae. Serie A. III. Geologica-Geographica ;   32 .