Silvio Meira, Regina Motz, Fernando Tepedino. A formal semantics for sql. Int. J. Comput. Math., 34(1-2):43-63, 1990. [doi]
@article{MeiraMT90,
title = {A formal semantics for sql},
author = {Silvio Meira and Regina Motz and Fernando Tepedino},
year = {1990},
doi = {10.1080/00207169008803862},
url = {https://doi.org/10.1080/00207169008803862},
researchr = {https://researchr.org/publication/MeiraMT90},
cites = {0},
citedby = {0},
journal = {Int. J. Comput. Math.},
volume = {34},
number = {1-2},
pages = {43-63},
}