Corrections to the Born-Oppenheimer approximation for a harmonic oscillator.  [electronic resource] 

 -  Physical review. A, Atomic, molecular, and optical physics  Feb 1993 
 - 879-883 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>1050-2947 
<br/><br/><label>Standard No.: </label>10.1103/physreva.47.879  doi