Fragments of Relations: First Hack.

David Maier, Jeffrey D. Ullman: Fragments of Relations: First Hack. XP2 Workshop on Relational Database Theory 1981:

@inproceedings{DBLP:conf/xp/MaierU81a,
  author    = {David Maier and
               Jeffrey D. Ullman},
  title     = {Fragments of Relations: First Hack},
  booktitle = {XP2 Workshop on Relational Database Theory, June 22-24 1981,
               The Pennsylvania State University, PA, USA},
  year      = {1981},
  ee        = {db/conf/xp/MaierU81a.html},
  crossref  = {DBLP:conf/xp/1981},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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