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- Author: Ronnie Lessem, Alexander Schieffer, Professor Ronnie Lessem, Dr Alexander Schieffer
- Language: English
- Year: 2010
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- Author: Elizabeth Mamukwa, Ronnie Lessem, Alexander Schieffer
- Language: English
- Year: 2016
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- Language: English
- Year: 2016
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- Author: Ronnie Lessem & Alexander Schieffer [eds]
- Language: English
- Year: 2010
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- Author: Alexander Schieffer Ronnie Lessem
- Language: English
- Year: 2016
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- Language: English
- Year: 2009
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- Author: Alexander Schieffer (auth.)
- Language: German
- Year: 1998