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Podehl, E. Topologische fragen der differentialgeometrie 25. raumkurvensysteme und gruppen. Abh.Math.Semin.Univ.Hambg. 8, 161–178 (1931). https://doi.org/10.1007/BF02940997
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DOI: https://doi.org/10.1007/BF02940997