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by Sohn, W.
Published in Die Mittelschule (1923)
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urn:nbn:de:0111-bbf-spo-4164715
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by Sohn, W., Seiffert, A. E.
Published in Journal of Vision (2005)
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by Vidnyanszky, Z., Sohn, W.
Published in Journal of Vision (2003)
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