Forman,  Nanny.  Froman, Per Olof <br/><br/>
JWKB approximation  Cointribtion to the theory 

 - x 
 - Amsterdam  North Holland  1965 
 - 138 
<br/><br/>x 
<br/><br/><label>ISBN: </label>x 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physics Physics 
<br/><br/><label>Dewey Class. No.: </label>530.122/FRJ