Geodesic
On central extensions of mapping class groups.
Mathematische Annalen, Tome 302 (1995) no. 2, pp. 131-150.

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Mots-clés : mapping class groups, actions of the handlebody subgroups on skein modules, cohomology classes of the extensions, topological quantum field theory 
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     author = {G. Masbaum and J.D. Roberts},
     title = {On central extensions of mapping class groups.},
     journal = {Mathematische Annalen},
     pages = {131--150},
     publisher = {mathdoc},
     volume = {302},
     number = {2},
     year = {1995},
     zbl = {0823.57010},
     url = {http://geodesic.mathdoc.fr/item/MAN_1995__302_2_165326/}
}
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G. Masbaum; J.D. Roberts. On central extensions of mapping class groups.. Mathematische Annalen, Tome 302 (1995) no. 2, pp. 131-150. http://geodesic.mathdoc.fr/item/MAN_1995__302_2_165326/