Bellman Richard <br/><br/>
Perturbation techniques and matheamatics, physics,a nd engineering 
Bellman Richard 
 -  1964 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>23682 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B4930C, K4