search query: @author Frentrop, P. / total: 2
references: 1-2 / 2
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title | year | author | ||
1. |
Economisch Statistische Berichte
1988 : SEP 7, VOL. 73:3672, p. 836-841 |
1988 | Frentrop, P. |
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2. |
Economisch Statistische Berichte
1988 : SEP 14, VOL. 73:3673, p. 836-841 |
1988 | Frentrop, P. |
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