search query: @author Jaspers, P. F. M. / total: 1
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title | year | author | ||
1. |
Economisch Statistische Berichte
1989 : JUN 21, VOL. 74:3712, p. 592-596, 600 |
1989 | Graaf, L. E. de Jaspers, P. F. M. Schreuder, H. |
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