The TeV energy spectrum of Markarian 501 measured with the stereoscopic telescope system of HEGRA during 1998 and 1999 - Aharonian, Felix A.; Akhperjanian, A.; Barrio, J.; Bernlöhr, Konrad; Heinzelmann, G.; Hermann, G.; Heusler, A.; Hofmann, Werner; Konopelko, Alexander; Kornmeyer, H.; Kranich, D.; Krawczynski, Henric; et al. (The astrophysical journal, 2001)
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