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Bibliography

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V. K. A. M. Guggenheim, Piecewise linear isotopies and embedding of elements and spheres. I, II, Proc. London Math. Soc. (3) 3 (1953), 129-152.

[2]

B. Mazur, A note on some contractible 4-manifolds, Ann. of Math. (2) 73 (1961), 221-228. MR 0125574 (23:A2873)

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R. Penrose, J. H. C. Whitehead and E. C. Zeeman, Imbedding of manifolds in euclidean space, Ann. of Math. (2) 73 (1961), 613-623. MR 0124909 (23:A2218)

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J. H. C. Whitehead, Simplicial spaces, nuclei and m-groups, Proc. London Math. Soc. (2) 45 (1939), 243-327.