Barna, T. (1954) “Activity Analysis of Production and Allocation. by T. C.Koopmans. Cowles Commission Research in Economics, Monograph 13. Wiley & Sons, New York 1952. 380 pp. $ 4,50”., Nationaløkonomisk Tidsskrift, 92. Tilgængelig hos: https://tidsskrift.dk/nationaloekonomisktidsskrift/article/view/60669 (Set: 1 januar 2026).