Data Documentation 26, 37 S.
Jan Goebel, C. Katharina Spieß, Nils R. J. Witte, Susanne Gerstenberg
2007
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DOI:
https://dx.doi.org/10.18723/diw_ddc:2007-26
Frei zugängliche Version: (econstor)
http://hdl.handle.net/10419/129237
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