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This paper presents the results of one phase of research carried out at the Jet Propulsion Laboratory, California Institute of Technology, under Contract NAS 7-100, sponsored by National Aeronautics and Space Administration
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Johnson, D. Conjugacy relations in subgroups of the mapping class group and a group-theoretic description of the Rochlin invariant. Math. Ann. 249, 243–263 (1980). https://doi.org/10.1007/BF01363898
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DOI: https://doi.org/10.1007/BF01363898