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Jet Propulsion Laboratory, California Institute of Technology, under Contract NAS 7-100, sponsored by National Aeronatucis and Space Administration
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Johnson, D. An abelian quotient of the mapping class groupI g . Math. Ann. 249, 225–242 (1980). https://doi.org/10.1007/BF01363897
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DOI: https://doi.org/10.1007/BF01363897