The 2012 flare of PG 1553+113 seen with H.E.S.S. and Fermi-LAT - Abramowski, Attila; Becherini, Yvonne; Jankowsky, Felix; Kaufmann, Sarah; Mohamed, Mahmoud; Quirrenbach, Andreas; Schwemmer, Stephanie; Zacharias, Michael (The astrophysical journal, 2015)