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J. W. Alexander, On the deformation of an n-cell, Proc. Nat. Acad. Sci. 9 (1923), 406-407.

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D. H. Gottlieb, Homotopy and isotopy properties of topological spaces, Canad. J. Math. 16 (1964), 561-571. MR 0163311 (29:614)

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S. T. Hu, Isotopy invariants of topological spaces, Proc. Roy. Soc. 255 (1960), 331-366. MR 0113226 (22:4064)

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C. W. Patty, The fundamental group of certain deleted product spaces, Trans. Amer. Math. Soc. 105 (1962), 314-321. MR 0143211 (26:771)

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-, The homology of deleted products of trees, Duke Math. J. 29 (1962), 413-428. MR 0141111 (25:4522)