1. Bontcheva, K., Cunningham, H., Maynard, D., Tablan, V., Saggion, H.: Developing reusable and robust language processing components for information systems using gate. In: 3rd International Workshop on Natural Language and Information Systems (NLIS 2002). Aix-en-Provence, pp. 223–227. Society Press (2002)
2. Catizone, R., Wilks, Y.: A companionable agent. In: Conversational Agents and Natural Language Interaction Techniques and Effective Practices, p. 302 (2011)
3. Cunningham, H., Humphreys, K., Gaizauskas, R.: Gate - a tipster-based general architecture for text engineering. In: Proceedings of the TIPSTER Text Program (Phase III) 6 Month Workshop. DARPA. Morgan Kaufmann (1997)
4. David Levy, B.L.C., Batacharia, B., Catizone, R., Krotov, A., Wilks, Y.: Converse: a conversational companion. In: Proc. of the 1st International Workshop on Human-Computer Conversation (1997)
5. Klüwer, T.: From chatbots to dialog systems. International Journal, 1–22 (2011)