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Published: Opladen : Leske + Budrich, 1998
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Published: Köln : PapyRossa-Verl., 1997
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Published: Köln : PapyRossa-Verl, 1992
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Published: Köln : Bund-Verl, 1993
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Published: Bonn : Dietz, 1993
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Published: Harlow, Essex : Longman, 1987
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Published: Köln : Bund Verl, 1992
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Published: Bremen [u.a.] : Steintor [u.a.], 1991
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