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Bol, G. Topologische Fragen der Differentialgeometrie 29. Ebenenbüschelgewebe. Abh.Math.Semin.Univ.Hambg. 8, 243–249 (1931). https://doi.org/10.1007/BF02941005
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DOI: https://doi.org/10.1007/BF02941005