Sperb, R.P <br/><br/>
Maximum principles & their applications 
R.P. Sperb 
 - New York  Academic Press  1981 
 - ix  224 
 - Mathematics in science & engineering 157 .
<br/><br/><label>ISBN: </label>0126568804 
<br/><br/><label>Dewey Class. No.: </label>10.03+6.03  / SPER