Variational estimates for excited states.  [electronic resource] 

 -  Physical review. D, Particles and fields  May 1995 
 - 5069-5078 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0556-2821 
<br/><br/><label>Standard No.: </label>10.1103/physrevd.51.5069  doi