Bellman, Richard <br/><br/>
Perturbation Techniques in Mathematics, Physics, and Engineering 
/ by Richard  Bellman 
 - New York:  Holt, Rinehart and Winston, Inc.,  1966. 
 - viii, 118p.; 
<br/><br/><label>ISBN: </label>000 
<br/><br/><label>Dewey Class. No.: </label>620  / BEL/P