1. J.F.Allen. Maintaining Knowledge about Temporal Intervals. Communications of the ACM, Vol. 16, Number 11, November 1983.
2. J.F.Allen. A Common-Sense Theory of Time. Proceedings of the International Joint Conference on Artificial Intelligence, 1985.
3. F.Bancilhon, R.Ramakrishnan. An Amateur’s Introduction to Recursive Query Processing Strategies. ACM SIGMOD Conference, 1986.
4. J.F.A.K. van Benthem. The Logic of Time. D.Reidel Publishing Company, 1983.
5. F.Bry. Towards an Efficient Evaluation of General Queries: Quantifier and Disjunction Processing Revisited. Proc. ACM SIGMOD Int. Cord. on Management of Data, 1989, pp. 193–204.