1. Aharonian, F. A., Nature, 416, 797, 2002.
2. Aharonian, F. A., and A. M. Atoyan, Astron. Astrophys., 309, 917, 1996.
3. Aharonian, F. A., L. O. C. Drury, and H. J. Völk, Astron. Astrophys., 285, 645, 1994.
4. Aharonian, F. et al., Astron. Astrophys., 370, 112, 2001.
5. Aharonian, F. et al., Astron. Astrophys., 393, L37, 2002.