Protter, Murray H. <br/><br/>
Maximum Principle In Differential Equations 
/ by Murray H. Protter & Hans F. Weinberger 
 - Newjersey:  Prentice-Hall,  1967. 
 - vii,261p. 
<br/><br/><label>Dewey Class. No.: </label>517.38  / PRO/M