311
T377L
           Theil, H
               Linear aggregation of economic relations \ H Theil - Amsterdam : North-Holland Publishing, 1954.
               xi, 205p. - Contributions to economic analysis/ed. by J Tinbergen, P J Verdoorn and H J Witteveen; vii .
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                Subjects: Aggregation (Chemistry); Microeconomics; Macroeconomics.