Tikhonov, A. N <br/><br/>
Differential equations 
A. N Tikhonov 
 - Berlin:  Springer- Verlog;  1984. 
 - viii, 238p. 
<br/><br/><label>Subjects--Index Terms: </label>Differential equations 
<br/><br/><label>Universal Decimal Class. No.: </label>517.9   / TIK