Aharonian, F <br/><br/>
Limits on an energy dependence of the speed of light from a flare of the active galaxy PKS 2155-304.  [electronic resource] 

 -  Physical review letters  Oct 2008 
 - 170402 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0031-9007 
<br/><br/><label>Standard No.: </label>10.1103/PhysRevLett.101.170402  doi