Ayres, Frank.  <br/><br/>
Theory and problems of differential equations / 

 - Singapore ,  MacGraw Hill,  c1952. 
 - 295p. ;  ill. ;  28 cm.  
<br/><br/><label>ISBN: </label>0070990069 
<br/><br/><label>Dewey Class. No.: </label>515.35  / 3668