Discovery of VHE γ-rays from the distant BL Lacertae 1ES 0347-121 - Aharonian, Felix A.; Behera, Bagmeet; Emmanoulopoulos, Dimitrios; Hauser, Marcus; Pedaletti, Giovanna; Pühlhofer, Gerd; Schwemmer, Stephanie; Tam, Pak Hin; Wagner, Stefan (Astronomy and astrophysics, 2007)