A Set Theoretic Data Structure and Retrieval Language.

William R. Hershey, Carol H. Easthope: A Set Theoretic Data Structure and Retrieval Language. SIGIR Forum 7(4): 45-54(1972)

@article{DBLP:journals/sigir/HersheyE72,
  author    = {William R. Hershey and
               Carol H. Easthope},
  title     = {A Set Theoretic Data Structure and Retrieval Language},
  journal   = {SIGIR Forum},
  volume    = {7},
  number    = {4},
  year      = {1972},
  pages     = {45-54},
  ee        = {db/journals/sigir/HersheyE72.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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