4Collins, M. and Brooks, J. Preposition phrase attachment through a backed-off model. In: Proceedings of the 3rd WVLC, Cambridge, MA, 1995.
5Schank, R., and Abelson, R. Scripts, Plans, Goals and Understanding: An Inquiry into Human Knowledge Structures. Hillsdale: Lawrence Erlbaum Associates, Publishers, 1977.
6Rich, Elaine. Artificial Intelligence. London: McGraw-Hill Book Company, 1983,295--344.
7In: Artificial Intelligence at MIT: Expending Frontiers, Vol.1. Winston, P. H., and Shellard, S.A. (eds.). Cambridge, Mass: MIT Press, 1990.
8Garside, R., Leech, G. and Sampson, G. (eds.). The Computational Analysis of English: A Corpus-Based Approach. London: Longman, 1989.
