L. Edwin McKenzie, Richard T. Snodgrass. Extending the Relational Algebra to Support Transaction Time. In Umeshwar Dayal, Irving L. Traiger, editors, Proceedings of the Association for Computing Machinery Special Interest Group on Management of Data 1987 Annual Conference, San Francisco, California, May 27-29, 1987. pages 467-478, ACM Press, 1987. [doi]
Abstract is missing.