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- 4 gamma rays: observations
- 2 galaxies: individual: M87
- 2 gamma rays: theory
- 2 radiation mechanisms: non-thermal
- 1 BL Lacertae objects: individual: ...
- 1 BL Lacertae objects: individual: ...
- 1 BL Lacertae objects: individual: ...
- 1 galaxies: BL Lacertae objects: ge...
- 1 galaxies: BL Lacertae objects: in...
- 1 galaxies: BL Lacertae objects: in...
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