Experimental IR meets multilinguality, multimodality, and interaction 11th International Conference of the CLEF Association, CLEF 2020, Thessaloniki, Greece, September 22–25, 2020 : proceedings - Arampatzis, Avi; Kanoulas, Evangelos; Tsikrika, Theodora; Vrochidis, Stefanos; Joho, Hideo; Lioma, Christina; Eickhoff, Carsten; Névéol, Aurélie; Cappellato, Linda; Ferro, Nicola (Lecture notes in computer science, 2020)