Experimental IR Meets Multilinguality, Multimodality, and Interaction 6th International Conference of the CLEF Association, CLEF'15, Toulouse, France, September 8-11, 2015, Proceedings - Mothe, Josiane; Savoy, Jacques; Kamps, Jaap; Pinel-Sauvagnat, Karen; Jones, Gareth J.F; SanJuan, Eric; Cappellato, Linda; Ferro, Nicola (Springer International Publishing : Imprint: Springer, 2015)