Landis, E.M <br/><br/>
Second order equations of elliptic & parabolic type 
E.M. Landis 
 - Providence  American Mathematical Society  1998 
 - xii  203 
 - Translations of mathematical monographs 171 .
<br/><br/><label>ISBN: </label>9780821808573 
<br/><br/><label>Dewey Class. No.: </label>10.03+10.04  / LAND