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by Held, A.
Published in Die Lehrerin in Schule und Haus (1909)
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by Held, A.
Published in Neue Bahnen <Leipzig> (1908)
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by Held, A.
Published in Allgemeine Schulzeitung (1867)
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published 2002
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by Held, A.
Published in Journal of Mathematical Physics (1976)
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