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J. F. Adams, On the formuli of Thom and Wu, Proc. London Math. Soc. 11 (1961), 741-752. MR 0139177 (25:2613)

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E. Artin, Geometric algebra, Interscience, New York, 1957. MR 0082463 (18:553e)

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W. Browder, Torsion in H-spaces, Ann. of Math. (2) 74 (1961), 24-51. MR 0124891 (23:A2201)

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M. Rueff, Beitrage zur Untersuchung der Abbildungen von Mannigfaltigen, Compositio Math. 6 (1938), 161-202. MR 1557021

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H. Seifert, Verschlingungsinvarianten, S.-B. Preuss. Akad. Wiss. 16 (1933), 811-828.

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S. Smale, On the structure of 5-manifolds, Ann. of Math. (2) 75 (1962), 38-46. MR 0141133 (25:4544)

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C. T. C. Wall, Killing the middle homotopy groups of odd dimensional manifolds, Trans. Amer. Math. Soc. 103 (1962), 421-433. MR 0139185 (25:2621)

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W. T. Wu, Classes caractéristiques et i-carrés d'une variété, C. R. Acad. Sci. Paris 230 (1950), 508-511. MR 0035992 (12:42f)

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-, Les i-carrés dans une variété grassmannienne, C. R. Acad. Sci. Paris 230 (1950), 918-920. MR 0035993 (12:42g)