Geodesic
The Second Homology Group of the Mapping Class Group of an Orientable Surface.
Inventiones mathematicae, Tome 72 (1983), pp. 221-240

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Mots-clés : second homology group, mapping class group, orientable surface, maximal systems of isotopy classes of nonintersecting simple closed curves, bordism classes of fiber bundles, Picard group, moduli space, Francetta conjecture 
John Harer. The Second Homology Group of the Mapping Class Group of an Orientable Surface.. Inventiones mathematicae, Tome 72 (1983), pp. 221-240. http://geodesic.mathdoc.fr/item/IM_1983__72_143018/
@article{IM_1983__72_143018,
     author = {John Harer},
     title = {The {Second} {Homology} {Group} of the {Mapping} {Class} {Group} of an {Orientable} {Surface.}},
     journal = {Inventiones mathematicae},
     pages = {221--240},
     year = {1983},
     volume = {72},
     zbl = {0533.57003},
     url = {http://geodesic.mathdoc.fr/item/IM_1983__72_143018/}
}
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