search query: @author Schaapveld, R. H. R. / total: 1
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| title | year | author | ||
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Economisch Statistische Berichte
1987 : MAR 11, VOL. 72:3597, p. 236-239 |
1987 | Klompenhouwer, K. J. R. Schaapveld, R. H. R. |
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