@article{DBLP:journals/cacm/BoyceCKH75,
author = {Raymond F. Boyce and
Donald D. Chamberlin and
W. Frank King III and
Michael Hammer},
title = {Specifying Queries as Relational Expressions: The SQUARE
Data Sublanguage},
journal = {Commun. ACM},
volume = {18},
number = {11},
year = {1975},
pages = {621-628},
ee = {http://doi.acm.org/10.1145/361219.361221},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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