GrumbachRT04'

@article{DBLP:journals/acta/GrumbachRT04,
  author    = {St{\'e}phane Grumbach and
               Maurizio Rafanelli and
               Leonardo Tininini},
  title     = {On the equivalence and rewriting of aggregate queries},
  journal   = {Acta Inf.},
  volume    = {40},
  number    = {8},
  year      = {2004},
  pages     = {529-584},
  ee        = {http://dx.doi.org/10.1007/s00236-004-0101-y},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}