@article{DBLP:journals/jcss/AbiteboulB86,
  author    = {Serge Abiteboul and
               Nicole Bidoit},
  title     = {Non First Normal Form Relations: An Algebra Allowing Data
               Restructuring},
  journal   = {J. Comput. Syst. Sci.},
  volume    = {33},
  number    = {3},
  year      = {1986},
  pages     = {361-393},
  ee        = {http://dx.doi.org/10.1016/0022-0000(86)90058-9},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}