Allen Van Gelder, Rodney W. Topor. Safety and Translation of Relational Calculus Queries. ACM Trans. Database Syst., 16(2):235-278, 1991. [doi]
@article{GelderT91,
title = {Safety and Translation of Relational Calculus Queries},
author = {Allen Van Gelder and Rodney W. Topor},
year = {1991},
doi = {10.1145/114325.103712},
url = {http://doi.acm.org/10.1145/114325.103712},
tags = {translation},
researchr = {https://researchr.org/publication/GelderT91},
cites = {0},
citedby = {0},
journal = {ACM Trans. Database Syst.},
volume = {16},
number = {2},
pages = {235-278},
}