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W. Ambrose, R. Palais and I. Singer Sprays, An. Acad. Brasil. Ci. 32 (1960), 163-178. MR 0126234 (23:A3530)

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R. Godement Topologie algébrique et théorie des faisceaux, Actualités Sci. Indust. No. 1252, Hermann, Paris, 1958. MR 0102797 (21:1583)

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M. Hirsch Differential topology, mimeographed notes, Univ. of California, Berkeley, Calif., 1962.

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