Simmons, George F. <br/><br/>
Differential equations: theory, technique, and practice / 
George F. Simmons 
 - New Delhi:  McGraw-Hill Science/Engineering/Math,  2007. 
 - 534 
<br/><br/><label>ISBN: </label>0070616094 
<br/><br/><label>Dewey Class. No.: </label>515.35  / SIM/D