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Both authors are supported by grants from the National Science Foundation
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Matsumoto, Y., Venema, G.A. Failure of the Dehn Lemma on contractible 4-manifolds. Invent Math 51, 205–218 (1979). https://doi.org/10.1007/BF01389914
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DOI: https://doi.org/10.1007/BF01389914