Gupta, Parmanand <br/><br/>
Comprehensive differential equations : including calculus of variations / 
Parmanand Gupta 
 - New Delhi :  Laxmi Publications ,  2007 
 - 420 p. ;  24 cm. 
<br/><br/><label>ISBN: </label>817008668X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations<br/>Differential equations--Textbooks