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Supported by a Science Research Council Postdoctoral Research Fellowship.
Research partially supported by National Science Foundation Grant GP-19964.
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Gordon, C.M., Sumners, D.W. Knotted ball pairs whose product with an interval is unknotted. Math. Ann. 217, 47–52 (1975). https://doi.org/10.1007/BF01363239
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DOI: https://doi.org/10.1007/BF01363239