Joy van Helvert, Peter van Rosmalen, Dirk Börner, Volha Petukhova, Jan Alexandersson. Observing, Coaching and Reflecting: A Multi-modal Natural Language-based Dialogue System in a Learning Context. In Davy Preuveneers, editor, Workshop Proceedings of the 11th International Conference on Intelligent Environments, Prague, Czech Republic, July 15-17, 2015. Volume 19 of Ambient Intelligence and Smart Environments, pages 220-227, IOS Press, 2015. [doi]