scientific article; zbMATH DE number 3025807
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Publication:5765936
zbMath0016.23005MaRDI QIDQ5765936
Heinz Hopf, L. S. Pontryagin, P. S. Aleksandrov
Publication date: 1937
Full work available at URL: http://www.numdam.org/item?id=CM_1937__4__239_0
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