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Hits 1-3 within 3 documents
Author(s): Leisering, Lutz.- 1993. 25p.
Author(s): Kock, Birgit; Witzel, Andreas.- 1993. 48p.
Author(s): Cramm, Cathleen; Blossfeld, Hans-Peter; Drobnic, Sonja.- 1998. 26p.