1. Biber, D., Conrad, S., Leech, G.: A Student Grammar of Spoken and Written English. Pearson ESL, London (2002)
2. Dias, M.B., Kannan, B., Browning, B., Jones, E.G., Argall, B., Dias, M.F., Zinck, M., Veloso, M.M., Stentz, A.J.: Sliding autonomy for peer-to-peer human-robot teams. In: Proceedings of the 10th International Conference on Intelligent Autonomous Systems (2008)
3. Dias, M.B., Harris, T.K., Browning, B., Jones, E.G, Argall, B., Veloso, M.M., Stentz, A., Rudnicky, A.I.: Dynamically formed human-robot teams performing coordinated tasks. In: AAAI Spring Symposium: To Boldly Go Where No Human-Robot Team Has Gone Before, pp. 30–38 (2006)
4. Ferketic, J., Goldblatt, L., Hodgson, E., Murray, S., Wichowski, R., Bradley, A., Chun, W., Evans, J., Fong, T., Goodrich, M., Steinfeld, A., Stiles, R.: Toward human-robot interface standards: use of standardization and intelligent subsystems for advancing human-robotic competency in space exploration. In: Proceedings of the SAE 36th International Conference on Environmental Systems (2006)
5. Forsberg, M.: Why is Speech Recognition Difficult. Chalmers University of Technology, Gothenburg (2003)