1. W. S. Davis, J. R. Carnes, and J. Allen . 1991 . Clustering temporal intervals to generate reference hierarchies . InKR91: Proceedings of the Second International Conference on Principles of Knowledge Representation and Reasoning. Morgan Kaufmann, pp.111 -117 .
2. M. Drummond, J. Bresina, and K. Swanson. 1994 . Just-in-case scheduling. Submitted for publication.