Guliy ,V.N.  <br/><br/>
IMPROVEMENT ON THE APPROXIMATIONS FOR THE AMPLITUDE OF SCATTERING BY SINGULAR POTENTIALS / / 
V. N.Guliy. 
 - kiev :  Acad. of Science of The Ukd. SSR Inst. Theoret. Physics,   1971. 
<br/><br/><label>Universal Decimal Class. No.: </label>539.171