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@article{DBLP:journals/tkde/Sarda90,
author = {Nandlal L. Sarda},
title = {Extensions to SQL for Historical Databases},
journal = {IEEE Trans. Knowl. Data Eng.},
volume = {2},
number = {2},
year = {1990},
pages = {220-230},
ee = {http://doi.ieeecomputersociety.org/10.1109/69.54721},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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