search query: @author Spangenberg, J.F.A. / total: 1
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| title | year | author | ||
| 1. |
Economisch Statistische Berichte
1990 : MAY 9, VOL. 75:3756, p. 424-427 |
1990 | Spangenberg, J.F.A. Schreuder, H. |
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