Lehto O <br/><br/>
Quasiconformal mappings in the plane. 

 - 2 
 -  1973 
<br/><br/><label>Standard No.: </label>108973 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B381:3, L3