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The content of this note was presented as a talk to the International Colloquium on Differential Geometry and Topology, Zürich, June 1960.
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Hilton, P.J. On excision and principal fibrations. Commentarii Mathematici Helvetici 35, 77–84 (1961). https://doi.org/10.1007/BF02567007
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DOI: https://doi.org/10.1007/BF02567007