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== External references ==
* [http://doi.acm.org/10.1145/1095495.1095500 "A set theoretic data structure and retrieval language"], William R. Hershey and Carol H. Easthope, Papers from the Session on Data Structures, Spring Joint Computer Conference, May 1972 in ''ACM SIGIR Forum'', Volume 7, Issue 4 (December 1972), pp. 45-55, DOI=10.1145/1095495.1095500, Special Interest Group on Information Retrieval, Association for Computing Machinery, New York, NY, USA
== External links==
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