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

Copyright ESO 2001
Published by EDP Sciences