Aggregates.

Nick Kline, Richard T. Snodgrass, T. Y. Cliff Leung: Aggregates. The TSQL2 Temporal Query Language 1995: 393-424

@incollection{DBLP:books/kl/snodgrass95/KlineSL95,
  author    = {Nick Kline and
               Richard T. Snodgrass and
               T. Y. Cliff Leung},
  title     = {Aggregates},
  booktitle = {The TSQL2 Temporal Query Language},
  publisher = {Kluwer},
  year      = {1995},
  isbn      = {0-7923-9614-6},
  pages     = {393-424},
  ee        = {db/books/collections/snodgrass95/KlineSL95.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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