Ng01'

@article{DBLP:journals/tods/Ng01,
  author    = {Wilfred Ng},
  title     = {An extension of the relational data model to incorporate
               ordered domains},
  journal   = {ACM Trans. Database Syst.},
  volume    = {26},
  number    = {3},
  year      = {2001},
  pages     = {344-383},
  ee        = {http://doi.acm.org/10.1145/502030.502033},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}