Abreu, P <br/><br/>
Measurement of the proton-air cross section at √s=57 TeV with the Pierre Auger Observatory.  [electronic resource] 

 -  Physical review letters  Aug 2012 
 - 062002 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>1079-7114 
<br/><br/><label>Standard No.: </label>10.1103/PhysRevLett.109.062002  doi