Dar S., Agrawal R. Extending SQL with generalized transitive closure // IEEE Transactions on Knowledge and Data Engineering.-1993.-Vol.5, N 5.-P. 799-812.

Dar S., Agrawal R. Extending SQL with generalized transitive closure // IEEE Transactions on Knowledge and Data Engineering.-1993.-Vol.5, N 5.-P. 799-812.
Dar S., Agrawal R. Extending SQL with generalized transitive closure // IEEE Transactions on Knowledge and Data Engineering.-1993.-Vol.5, N 5.-P. 799–812.
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