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- 2 Gamma rays: galaxies
- 1 BL Lacertae objects: individual: ...
- 1 BL Lacertae objects: individual: ...
- 1 BL Lacertae objects: individual: ...
- 1 cosmic rays; gamma rays: general;...
- 1 galaxies: active
- 1 galaxies: magnetic fields
- 1 gamma rays: general
- 1 gamma rays: general; gamma-ray bu...
- 1 Gamma rays: ISM
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