Nested Historical Relations
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\begin{bibtex} @inproceedings{DBLP:conf/sigmod/TanselG89, crossref={DBLP:conf/sigmod/89}, title={Nested Historical Relations}, pages={284-294}, year={1989}, booktitle={SIGMOD Conference}, ee={http://doi.acm.org/10.1145/67544.66953}, url={http://www.informatik.uni-trier.de/~ley/db/conf/sigmod/sigmod89.html#TanselG89}, ee={db/conf/sigmod/TanselG89.html}, cdrom={SIGMOD89/P284.PDF}, author={Abdullah Uz Tansel and Lucy Garnett} }\end{bibtex}
