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https://doi.org/10.11588/ger.1925.3
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https://doi.org/10.11588/ger.1925.1
https://doi.org/10.11588/ger.1924.2
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https://doi.org/10.11588/ger.1923.2
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https://doi.org/10.11588/ger.1921.3
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https://doi.org/10.11588/ger.1917.3
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https://doi.org/10.11588/ger.1917.1