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Blaschke, W. Topologische fragen der differentialgeometrie 19. flächengewebe und ihre diagonalen. Abh.Math.Semin.Univ.Hambg. 8, 56–82 (1931). https://doi.org/10.1007/BF02940987
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DOI: https://doi.org/10.1007/BF02940987