A. Chandra, D. Harel. Structure and Complexity of Relational Queries. J. Comp. Sys. Sci, 25:99-128, 1982.
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@article{chha82,
Author = {Chandra, A. and Harel, D.},
Title = {Structure and Complexity of Relational Queries},
Journal = {J. Comp. Sys. Sci},
Volume = {25},
Pages = {99--128},
Year = {1982}
}
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