Protter, Murray H. <br/><br/>
Maximum principles in differential equations. 
Murray H. Protter and Hens F. Weinberger 
 - NewYork,  Springer-Verlag,  1984. 
 - ix, 261p. 
<br/><br/><label>Subjects--Index Terms: </label>Maximum principles in differential equations. 
<br/><br/><label>Universal Decimal Class. No.: </label>517.95  / PRO