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by Freund, B.
Published in Pädagogische Reform (1892)
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by Freund, B.
Published in Pädagogische Reform (1892)
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7
by Freund, B.
Published in Pädagogische Reform (1891)
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8
by Freund, B.
Published in Pädagogische Reform (1891)
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9
by List, P., Freund, B.
Published in Planta Medica (1968)
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10
by Freund, B., Cantow, H.-J.
Published in Polymer Bulletin (1985)
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11
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