Evidence for VHE γ-ray emission from the distant BL Lac PG 1553+113 F. Aharonian, A. G. Akhperjanian, A. R. Bazer-Bachi, M. Beilicke, W. Benbow, D. Berge, K. Bernlöhr, C. Boisson, O. Bolz, V. Borrel et al. (93 more) A&A, 448 2 (2006) L19-L23 Published online: 24 February 2006 DOI: 10.1051/0004-6361:200600010