Bhavani M. Thuraisingham. Computing Transitive Closures of Multilevel Relations. SIGMOD Record, 19(3):17-23, 1990. [doi]
@article{Thuraisingham90-1,
title = {Computing Transitive Closures of Multilevel Relations},
author = {Bhavani M. Thuraisingham},
year = {1990},
doi = {10.1145/101077.101081},
url = {http://doi.acm.org/10.1145/101077.101081},
researchr = {https://researchr.org/publication/Thuraisingham90-1},
cites = {0},
citedby = {0},
journal = {SIGMOD Record},
volume = {19},
number = {3},
pages = {17-23},
}