@incollection{DBLP:books/kl/snodgrass95/LeungJS95,
  author    = {T. Y. Cliff Leung and
               Christian S. Jensen and
               Richard T. Snodgrass},
  title     = {Modification},
  booktitle = {The TSQL2 Temporal Query Language},
  year      = {1995},
  pages     = {297-302},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}