Raymond F. Boyce, Donald D. Chamberlin, W. Frank King III, Michael Hammer. Specifying Queries as Relational Expressions: The SQUARE Data Sublanguage. Communications of the ACM, 18(11):621-628, 1975. [doi]
@article{BoyceCKH75,
title = {Specifying Queries as Relational Expressions: The SQUARE Data Sublanguage},
author = {Raymond F. Boyce and Donald D. Chamberlin and W. Frank King III and Michael Hammer},
year = {1975},
tags = {data-flow},
researchr = {https://researchr.org/publication/BoyceCKH75},
cites = {0},
citedby = {0},
journal = {Communications of the ACM},
volume = {18},
number = {11},
pages = {621-628},
}