H.E.S.S. discovery of VHE γ-rays from the quasar PKS 1510−089 - Abramowski, Attila; Wagner, Stefan; Zacharias, Michael; Becherini, Yvonne; Behera, Bagmeet; Cologna, Gabriele; Hauser, Marcus; Kaufmann, Sarah; Mohamed, Mahmoud; Quirrenbach, Andreas; Schwemmer, Stephanie (Astronomy and astrophysics, 2013)