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J1] .3., 4 ., ) . 4 & . 0 !, ! - '* . 3! '. - 5.: 6!, 2000, - 1112 .

J2] &. 3! ' ' ! 4 . - )0.: 0, 2003, - 800 . J3] Codd E.F. A Relational Model of data for Large Shared Databanks //Communications of the

ACM, 1970.

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