Ralston and Pire reply.  [electronic resource] 

 -  Physical review letters  Oct 1991 
 - 2112 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>1079-7114 
<br/><br/><label>Standard No.: </label>10.1103/PhysRevLett.67.2112  doi