search query: @author Koopman, G. J. / total: 1
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title | year | author | ||
1. |
Economisch Statistische Berichte
1989 : JUN 5, VOL. 74:3714, p. 643-648 |
1989 | Koopman, G. J. Paridon, C. W. A. M. van |
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