The Surrogate Data Type.

Christian S. Jensen, Richard T. Snodgrass: The Surrogate Data Type. The TSQL2 Temporal Query Language 1995: 149-152

@incollection{DBLP:books/kl/snodgrass95/JensenS95,
  author    = {Christian S. Jensen and
               Richard T. Snodgrass},
  title     = {The Surrogate Data Type},
  booktitle = {The TSQL2 Temporal Query Language},
  year      = {1995},
  pages     = {149-152},
  ee        = {db/books/collections/snodgrass95/JensenS95.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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