Generalized Joins.

@article{DBLP:journals/sigmod/LacroixP76,
  author    = {Michel Lacroix and
               Alain Pirotte},
  title     = {Generalized Joins},
  journal   = {SIGMOD Record},
  volume    = {8},
  number    = {3},
  year      = {1976},
  pages     = {14-15},
  ee        = {http://doi.acm.org/10.1145/984378.984379, db/journals/sigmod/LacroixP76.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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