Probing a possible vacuum refractive index with γ-ray telescopes☆

@article{Ellis2009ProbingAP,
  title={Probing a possible vacuum refractive index with $\gamma$-ray telescopes☆},
  author={John Ellis and Nick E. Mavromatos and Dimitri V. Nanopoulos},
  journal={Physics Letters B},
  year={2009},
  volume={674},
  pages={83-86}
}
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