The Data Model for Time.

Curtis E. Dyreson, Michael D. Soo, Richard T. Snodgrass: The Data Model for Time. The TSQL2 Temporal Query Language 1995: 93-98

@incollection{DBLP:books/kl/snodgrass95/DyresonSS95,
  author    = {Curtis E. Dyreson and
               Michael D. Soo and
               Richard T. Snodgrass},
  title     = {The Data Model for Time},
  booktitle = {The TSQL2 Temporal Query Language},
  year      = {1995},
  pages     = {93-98},
  ee        = {db/books/collections/snodgrass95/DyresonSS95.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}