1. Banko , M. Etzioni , O. 2008 The tradeoffs between open and traditional relation extraction Proceedings of ACL 2008: HLT 28 36
2. Bohus , D. Horvitz , E. 2009 Open-world dialog: Challenges, directions and a prototype
3. Robots that imitate humans;Breazeal;Trends in Cognitive Science,2002