For citations:
Frenkel A.A., Tikhomirov B.I., Sergiyenko Ya.V., Surkov A.A. The Integral Index of Business Activity: Methods of Constructing. Economics of Contemporary Russia. 2021;(4):78-88. (In Russ.) https://doi.org/10.33293/1609-1442-2021-4(95)-78-88
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