Global Cardinality Constraints.

@inproceedings{DBLP:conf/er/Hartmann96,
  author    = {Sven Hartmann},
  editor    = {Meike Albrecht and
               Bernhard Thalheim},
  title     = {Global Cardinality Constraints},
  booktitle = {Proccedings of the Workshop Challenges of Application and Challenges
               of Design, 15th International Conference on Conceptual Modeling,
               Cottbus, Germany, October 9, 1996},
  publisher = {Brandenburg Technical University},
  year      = {1996},
  pages     = {196-206},
  ee        = {db/conf/er/Hartmann96.html},
  crossref  = {DBLP:conf/er/96w2},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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