Simmonds, James G <br/><br/>
First look at perturbation theory 

 - 2 
 - New York  Dover  1998 
 - x, 139p.  
<br/><br/> Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>486675513 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Perturbation theory