Simmonds, James G, <br/><br/>
First look at Perturbation Theory 

 - 2nd ed. 
 - New York:  Dover Publication,  1988. 
 - x, 139 p.:   ill.;  22cm. 
<br/><br/> Includes bibliographical references (p. 121-122) and index. 
<br/><br/><label>ISBN: </label>9780486675510 
<br/><br/><label>Dewey Class. No.: </label>515.35 SIM