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References
Smale, S.: Generalized Poincaré's conjecture in dimensions greater than4. Annals of Math.74, 391–406 (1961).
Wall, C. T. C.: Diffeomorphisms of 4-manifolds. Journal London Math. Soc.39, 131–140 (1964).
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R. A. Norman died in an accident on the Welsh mountains in the spring of 1967. This paper has been compiled from some of his results.
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Norman, R.A. Dehn's Lemma for certain 4-manifolds. Invent Math 7, 143–147 (1969). https://doi.org/10.1007/BF01389797
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DOI: https://doi.org/10.1007/BF01389797