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Nehrkorn, H. Topologische fragen der differentialgeometrie 33. schnittpunktsätze in ebenen geflechten. Abh.Math.Semin.Univ.Hambg. 8, 403–412 (1931). https://doi.org/10.1007/BF02941018
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DOI: https://doi.org/10.1007/BF02941018