Lehto, O. <br/><br/>
Quasiconformal mappings in plane. 
by O. Lehto and K. I. Virtanen; translated from the German by K. W. Lucas 
 - 2nd ed. 
 - Berlin  Springer-Verlag  1973 
 - vii,258p.; 24cm. 
<br/><br/><label>Dewey Class. No.: </label>515.73  / LEH