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Bol, G., Howe, G. Topologische fragen der differentialgeometrie 27. invarianten von differenziatorgespinsten. Abh.Math.Semin.Univ.Hambg. 8, 194–200 (1931). https://doi.org/10.1007/BF02941000
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DOI: https://doi.org/10.1007/BF02941000