Comments, with reply, on "Extensions to SQL for historical databases" by N.L. Sarda

The commenters point out that the author of the above-titled paper (see ibid., vol.2, p.220-30, 1990) failed to acknowledge their contemporary publications of almost identical results and the subsequent, comprehensive refinement of this work. The author replies that he did not have access to their publications. He indicates some differences between their work and his.<
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