Data Documentation 30, 22 S.
Martin Spieß, Martin Kroh, Rainer Pischner, Gert G. Wagner
2008
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DOI:
https://dx.doi.org/10.18723/diw_ddc:2008-30
Frei zugängliche Version: (econstor)
http://hdl.handle.net/10419/129241
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