Observations of Mkn 421 in 2004 with HESS at large zenith angles F. Aharonian, A. G. Akhperjanian, K.-M. Aye, A. R. Bazer-Bachi, M. Beilicke, W. Benbow, D. Berge, P. Berghaus, K. Bernlöhr, C. Boisson et al. (88 more) A&A, 437 1 (2005) 95-99 Published online: 10 June 2005 DOI: 10.1051/0004-6361:20053050