Tansel86'

@article{DBLP:journals/is/Tansel86,
  author    = {Abdullah Uz Tansel},
  title     = {Adding time dimension to relational model and extending
               relational algebra},
  journal   = {Inf. Syst.},
  volume    = {11},
  number    = {4},
  year      = {1986},
  pages     = {343-355},
  ee        = {http://dx.doi.org/10.1016/0306-4379(86)90014-1},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}