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@article{DBLP:journals/jacm/AtseriasDK06,
author = {Albert Atserias and
Anuj Dawar and
Phokion G. Kolaitis},
title = {On preservation under homomorphisms and unions of conjunctive
queries},
journal = {J. ACM},
volume = {53},
number = {2},
year = {2006},
pages = {208-237},
ee = {http://doi.acm.org/10.1145/1131342.1131344},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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