Watanabe, Takuya <br/><br/>
Exact WKB approach to 2-level adiabatic transition problems with a small spectral gap / 
by Takuya Watanabe. 
 - Sendai, Japan :  Tohoku University,  2012. 
 - 68 p. 
 - Tohoku mathematical publications  Nr. 37  1343-9499 .
<br/><br/>Thesis(doctoral)- Tohoku University, 2007 
<br/><br/>Includes bibliogr. references : (p.66-68) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adiabatic invariants<br/>WKB approximation