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Abstract (A&A 406 p.L9)

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References

 
• Aharonian, F. A., Akhperjanian, A. G., Barrio, J. A., et al. 1997, A&A, 327, L5 NASA ADS  
• Aharonian, F. A., Akhperjanian, A. G., Barrio, J. A., et al. 1999, A&A, 342, 69 NASA ADS  
• Aharonian, F. A., Akhperjanian, A. G., Barrio, J. A., et al. 2000, ApJ, 539, 317 NASA ADS  
• Aharonian, F. A., Akhperjanian, A. G., Barrio, J. A., et al. 2001, A&A, 370, 112 NASA ADS  
• Aharonian, F. A. 2001, in Proc. of the 27th ICRC, Hamburg, Highlight papers, 250, also [astro-ph/0112314]  
• Aharonian, F. A., Akhperjanian, A. G., Barrio, J. A., et al. 2002, A&A, 384, L23 NASA ADS  
• Aharonian, F. A., Akhperjanian, A. G., Beilicke, M., et al. 2003a, A&A, 403, 523 NASA ADS  
• Aharonian, F. A., Akhperjanian, A. G., Beilicke, M., et al. 2003b, A&A, 403, L1 NASA ADS  
• Catanese, M., Akerlof, C. W., Badran, H. M., et al. 1998, ApJ, 501, 616 NASA ADS  
• Chadwick, P. M., Lyons, K., McComb, T. J. L., et al. 1999, ApJ, 513, 161 NASA ADS  
• Costamante, L., & Ghisellini, G. 2002, A&A, 384, 56 NASA ADS  
• Daum, A., Hermann, G., Heß, M., et al. 1997, Astropart. Phys., 8, 1 NASA ADS  
• Djannati-Ataï, A., Khelifi, B., Vorobiov, S., et al. 2002, A&A, 391, L25 NASA ADS  
• Elvis, M., Plummer, D., Schachter, J., et al. 1992, ApJS, 80, 257 NASA ADS  
• Fossati, G., Maraschi, L., Celotti, A., et al. 1998, MNRAS, 299, 433 NASA ADS  
• Götting, N., & the HEGRA collaboration 2001, Talk at the 27th ICRC, Hamburg  
• Hofmann, W., Jung, I., Konopelko, A., et al. 1999, Astropart. Phys., 12, 135 NASA ADS  
• Holder, J., Bond, I. H., Boyle, P. J., et al. 2002, ApJ, 583, L9 NASA ADS  
• Horan, D., Badran, H. M., Bond, I. H., et al. 2002, ApJ, 571, 753 NASA ADS  
• Horns, D., & the HEGRA collaboration 2002, to appear in Proc. of High Energy Blazar Astronomy, Turku, also [astro-ph/0209454]  
• Konopelko, A., Hemberger, M., Aharonian, F. A., et al. 1999, Astropart. Phys., 10, 275 NASA ADS  
• Kranich, D., & the HEGRA collaboration 2002, to appear in Proc. of High Energy Blazar Astronomy, Turku  
• Li, T.-P., & Ma, Y.-Q. 1983, ApJ, 272, 317 NASA ADS  
• Neshpor, Y. I., Stepanyan, A. A., Kalekin, O. P., et al. 1998, Astron. Lett., 24, 134 NASA ADS  
• Nishiyama, T., Chamoto, N., Chikawa, M., et al. 1999, in Proc. of the 26th ICRC, Salt Lake City, 3, 370  
• Petry, D., Bond, I. H., Bradbury, S. M., et al. 2002, ApJ, 580, 104 NASA ADS  
• Pühlhofer, G., Bolz, O., Götting, N., et al. 2003, in preparation  
• Schachter, J. F., Stocke, J. T., Perlman, E., et al. 1993, ApJ, 412, 541 NASA ADS  
• Stecker, F. W., De Jager, O. C., & Salamon, M. H. 1996, ApJ, 473, L75 NASA ADS  
• Vorobiov, S., & the CAT collaboration 2002, Talk at the 18th ECRS, Moscow

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Abstract (A&A 406 p.L9)

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

• If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
• You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
• You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.