Design and Validation of ECA Gestures to Improve Dialogue System Robustness Beatriz López author Álvaro Hernández author David Díaz author Rubén Fernández author Luis Hernández author Doroteo Torre author 2007-06 text Proceedings of the Workshop on Embodied Language Processing Justine Cassell editor Dirk Heylen editor Association for Computational Linguistics Prague, Czech Republic conference publication lopez-etal-2007-design https://aclanthology.org/W07-1909/ 2007-06 67 74