R. Moore, D. Appelt, J. Dowding, J. Gawron, и D. Moran. Proceedings of the January 1995 ARPA Spoken Language Systems
Technology Workshop, стр. 261--264. Austin, TX, Morgan Kaufmann, (1995)
J. Niekrasz, M. Purver, J. Dowding, и S. Peters. Proceedings of the 2005 AAAI Spring Symposium on Persistent Assistants:
Living and Working with AI, Stanford, California, USA, (марта 2005)