The Data Model for Time.

@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}
}

Referenced by

1. Curtis E. Dyreson, Richard T. Snodgrass: Supporting Valid-Time Indeterminacy. ACM Trans. Database Syst. 23(1): 1-57(1998)