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    ANALYSIS competition Problem No. 17.Inge Ackermann - 1978 - Analysis 38 (2):65.
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  2. Wittgenstein's Fairy Tale.Inge Ackermann, Robert Ackermann & Betty Hendricks - 1978 - Analysis 38 (3):159 - 160.
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    Wittgenstein's fairy tale.Inge Ackermann & Alonso Church - 1978 - Analysis 38 (3):159.
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