Albert Atserias, Anuj Dawar, Phokion G. Kolaitis
On Preservation under Homomorphisms and Unions of Conjunctive Queries
PODS, 2004.
@inproceedings{PODS-2004-AtseriasDK,
author = "Albert Atserias and Anuj Dawar and Phokion G. Kolaitis",
booktitle = "{Proceedings of the 23rd Symposium on Principles of Database Systems}",
doi = "10.1145/1055558.1055602",
ee = "http://www.acm.org/sigmod/pods/proc04/pdf/P-32.pdf",
isbn = "1-58113-858-X",
pages = "319--329",
publisher = "{ACM}",
title = "{On Preservation under Homomorphisms and Unions of Conjunctive Queries}",
year = 2004,
}