# 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}
}
• Published 26 January 2009
• Physics
• Physics Letters B
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