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

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