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1 Introduction
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2 Sample
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3 Gamma-ray variability
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4 Uncatalogued supernova remnants
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5 Search for extended radio counterparts in selected sources
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6 Point-like counterparts: Systematic search
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7 Discussion: The black hole hypothesis
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8 Conclusions
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Appendix A: SNR candidates
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Appendix B: Variability of AGNs
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Appendix C: Variability analysis of all low latitude
gamma-ray sources
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References
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