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:  2
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., . . .: . , 1974. 272 .
(: 4550, : 635, : 7)
., . . . . .: , 1974. 272 . / Ackoff R., Emery F. On Purposeful Systems: An Interdisciplinary Analysis of Individual and Social Behavior as a System of Purposeful Events. 2nd ed. New York: Aldine Transaction, 2005. 303 p.
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