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• [2] Morris W. Hirsch, Immersions of manifolds, Trans. Amer. Math. Soc. 93 (1959), 242–276. MR 0119214, 10.1090/S0002-9947-1959-0119214-4
• [3] I. M. James, Some embeddings of projective spaces, Proc. Cambridge Philos. Soc. 55 (1959), 294–298. MR 0109350
• [4] S. D. Liao, On the theory of obstructions of fiber bundles, Ann. of Math. (2) 60 (1954), 146–191. MR 0062441
• [5] W. S. Massey, On the cohomology ring of a sphere bundle, J. Math. Mech. 7 (1958), 265-289. MR 0093763
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• [7] W. S. Massey, On the normal bundle of a sphere imbedded in Euclidean space, Proc. Amer. Math. Soc. 10 (1959), 959–964. MR 0109351, 10.1090/S0002-9939-1959-0109351-8
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A. Dold, Über fasernweise Homotopieäquivalenz von Faserräumen, Math. Z. vol. 62 (1955) pp. 111-136. MR 0073986 (17:519d)

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M. W. Hirsch, Immersions of manifolds, Trans. Amer. Math. Soc. vol. 93 (1959) pp. 242-276. MR 0119214 (22:9980)

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I. M. James, Some embeddings of projective spaces, Proc. Cambridge Philos. Soc. vol. 55 (1959) pp. 294-298. MR 0109350 (22:236)

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S. D. Liao, On the theory of obstructions of fiber bundles, Ann. of Math. vol. 60 (1954) pp. 146-191. MR 0062441 (15:979d)

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W. S. Massey, On the cohomology ring of a sphere bundle, J. Math. Mech. vol. 7 (1958) pp. 265-290. MR 0093763 (20:283)

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-, On the normal bundle of a sphere imbedded in Euclidean space, Proc. Amer. Math. Soc. vol. 10 (1959) pp. 959-964. MR 0109351 (22:237)

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N. E. Steenrod, The topology of fibre bundles, Princeton, Princeton University Press, 1951. MR 0039258 (12:522b)

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W. T. Wu, Classes charactéristiques et -carrés d'une variété, C. R. Acad. Sci. Paris vol. 230 (1950) pp. 508-511.