Astala, Kari et al <br/><br/>
Elliptic partial differential equations and quasiconformal mappings in the plane   
by Kari Astala et al 
 - Oxford  Princeton University Press  2008 
 - xiv, 677p 
<br/><br/><label>ISBN: </label>9780691137773 
<br/><br/><label>Dewey Class. No.: </label>515.93  / P09