[1] Robert Axelrod. The Evolution of Cooperation. Basic Books, New York, 1984.

[2] John Batali. Computational simulations of the emergence of grammar. In Approaches to the Evolution of Language: Social and Cognitive Bases, pages 405--426. Cambridge University Press, Cambridge, 1998.

[3] A. Cangelosi and D. Parisi. The emergence of language in an evolving population of neural networks. In Proceedings of the 18th Conference of the Cognitive Science Society. San Diego, 1996.

[4] Bart de Boer. Emergent vowel systems in a population of agents. In Proceedings of ECAL-97, Brighton UK, 1997. The MIT Press, Cambridge, Ma., 1997.

[5] James R. Hurford. Biological evolution of the saussurean sign as a component of the language acquisition device. Lingua, 77:189--222, 1989.

[6] Simon Kirby. Function, Selection and Innateness: the Emergence of Language Universals. Oxford University Press, 1999.

[7] T. Oates, Z. Eyler-Walker, and P. Cohen. Using syntax to learn semantics: An experiment in language acquisition with a mobile robot. Technical Report 99-35, Computer Science Department, University of Massachusetts, 1999.

[8] M. Oliphant. The dilemma of saussurean communication. BioSystems, 37 (1-2):31--38, 1996.

[9] L. Steels and F. Kaplan. Bootstrapping grounded word semantics. In T. Briscoe, editor, Linguistic evolution through language acquisition: formal and computational models. Cambridge University Press, Cambridge, UK, 1999.

[10] Luc Steels. Emergent adaptive lexicons. In P. Maes, editor, Proceedings of the Simulation of Adaptive Behaviour Conference. The MIT Press, Cambridge, Ma., 1996.

[11] Luc Steels. The origins of syntax in visually grounded robotic agents. In M. Pollack, editor, Proceedings of the 15th International Joint Conference on Artificial Intelligence. Morgan Kauffman, 1997.

[12] Luc Steels and Fr'ed'eric Kaplan. Stochasticity as a source of innovation in language games. In Proceedings of Artificial Life VI. The MIT Press, Cambridge, Ma., 1998.

[13] Luc Steels and Paul Vogt. Grounding adaptive language games in robotic agents. In Proceedings of the 4th European Conference on Artificial Life. The MIT Press, Cambridge, Ma., 1997.