papers:
David L. Roberts, Andrew S. Cantino, and Charles L. Isbell. Player Autonomy versus Designer Intent: A Case Study of Interactive Tour Guides. In Proceedings of the Third Conference and Artificial Intelligence for Interactive Digital Entertainment (AIIDE-07), Palo Alto, California, 2007.
Andrew Cantino, David L. Roberts, and Charles L. Isbell. Autonomous Nondeterministic Tour Guides: Improving Quality of Experience with TTD-MDPs. In Proceedings of the Sixth International Joint Conference on Autonomous Agents and Multiagent Systems (AAMAS-07), Honolulu, Hawai'i, 2007.