search query: @author Leenstra, H. A. / total: 1
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| title | year | author | ||
| 1. |
Economisch Statistische Berichte
1988 : NOV 2, VOL. 73:3680, p. 1043-1048 |
1988 | Heeres, G. J. Leenstra, H. A. |
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