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This material is based upon work supported by the National Science Foundation under Grant No. NSF MCS 80-02325
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Harer, J. The second homology group of the mapping class group of an orientable surface. Invent Math 72, 221–239 (1983). https://doi.org/10.1007/BF01389321
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DOI: https://doi.org/10.1007/BF01389321