Search for very-high-energy γ-ray emission from galactic globular clusters with H.E.S.S - Abramowski, Attila; Becherini, Yvonne; Cologna, Gabriele; Kaufmann, Sarah; Mohamed, Mahmoud; Quirrenbach, Andreas; Schwemmer, Stephanie; Wagner, Stefan; Zacharias, Michael (Astronomy and astrophysics, 2013)