HullS94'

@article{DBLP:journals/acta/HullS94,
  author    = {Richard Hull and
               Jianwen Su},
  title     = {Domain Independence and the Relational Calculus},
  journal   = {Acta Inf.},
  volume    = {31},
  number    = {6},
  year      = {1994},
  pages     = {513-524},
  ee        = {http://dx.doi.org/10.1007/BF01213204},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}