GuntherB90'

@article{DBLP:journals/sigmod/GuntherB90,
  author    = {Oliver G{\"u}nther and
               Alejandro P. Buchmann},
  title     = {Research Issues in Spatial Databases},
  journal   = {SIGMOD Record},
  volume    = {19},
  number    = {4},
  year      = {1990},
  pages     = {61-68},
  ee        = {http://doi.acm.org/10.1145/122058.122065},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}