1. Maintaining knowledge about temporal intervals
2. A temporally oriented data model
3. Barbara , D. , H. Garcia-Molina , and D. Porter . “A Probabilistic Relational Data Model.” InProceedings of the 2nd International Conference on Extending Database Technology: Advances in Database Technology, edited by F. Bancilhon, C. Thanos, and D. Tsichritzis, 60–74. Venice, Italy , New York : Springer-Verlag , 1990 .
4. A Formal Theory of Consensus