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Partially supported by NSF Grant MCS 78-02995 and an Alfred P. Sloan Research Fellowship
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Gordon, C.M. Ribbon concordance of knots in the 3-sphere. Math. Ann. 257, 157–170 (1981). https://doi.org/10.1007/BF01458281
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DOI: https://doi.org/10.1007/BF01458281