References
Zie F. de Roos: „Inleiding tot de theorie der internationale economische be trekkingen”, Haarlem 1957, pag. 45.
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Van Der Boor, I.E.G., Veldkamp, A.F. Naschrift. De Economist 107, 628–630 (1959). https://doi.org/10.1007/BF02192741
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DOI: https://doi.org/10.1007/BF02192741