W. Wobcke, A. Nguyen, V. Ho, and A. Krzywicki. Interaction Challenges for Intelligent Assistants, volume SS-07-04 of AAAI Technical Report, page 135-136. AAAI Press, (2007)
A. Krzywicki, B. Heap, M. Bain, W. Wobcke, and S. Schmeidl. Australasian Conference on Artificial Intelligence, volume 11320 of Lecture Notes in Computer Science, page 819-827. Springer, (2018)