@inproceedings{DBLP:conf/edbt/Guting88,
  author    = {Ralf Hartmut G{\"u}ting},
  title     = {Geo-Relational Algebra: A Model and Query Language for Geometric
               Database Systems},
  booktitle = {EDBT},
  year      = {1988},
  pages     = {506-527},
  ee        = {http://dx.doi.org/10.1007/3-540-19074-0_70},
  crossref  = {DBLP:conf/edbt/88},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/edbt/88,
  editor    = {Joachim W. Schmidt and
               Stefano Ceri and
               Michele Missikoff},
  title     = {Advances in Database Technology - EDBT'88, Proceedings of
               the International Conference on Extending Database Technology,
               Venice, Italy, March 14-18, 1988},
  booktitle = {EDBT},
  publisher = {Springer},
  series    = {Lecture Notes in Computer Science},
  volume    = {303},
  year      = {1988},
  isbn      = {3-540-19074-0},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}