1. Badler, N., Phillips, C. and Webber, B. (1993), Simulating Humans: Computer Graphics, Animation, Control. Oxford: Oxford University Press.
2. Badler, N., Webber, B., Becket, W., Douville, B., Geib, C., Moore, M., Pelachaud, C., Reich, B., and Stone, M. (1996), Planning for Animation. In Interactive Computer Animation, Maginet-Thalmanni, N. and Thalmanni, D. (eds.), Hemel Hampstead: Prentice Hall.
3. Becket, W. (1994), The Jack Lisp api, Technical Report MS-CIS-94-01/Graphics Lab 59, Philadelphia: University of Pennsylvania.
4. Technical Report MS-CIS-93-91;B. Eugenio Di,1993
5. Di Eugenio, B. (1994), Action Representation and Natural Language Instructions. In Proc. 4th Intern. Conference on Principles of Knowledge Representation and Reasoning (KR '94), Bonn.