Fröman, Nanny. <br/><br/>
JWKB approximation :  contributions to the theory / 
Nanny Fröman, Per Olof Fröman. 
 - Amsterdam,  North-Holland Pub. Co.; [sole distributors for U.S.A.: Interscience Publishers, New York]  1965. 
 - viii, 138 p. :  illus. ;  23 cm. 
<br/><br/>Includes bibliography and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Perturbation (Quantum dynamics)
<br/><br/><label>Dewey Class. No.: </label>530.12  / FRJ 1965