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@article{MAN_1980__249_163403, author = {Dennis Johnson}, title = {An {Abelian} {Quotient} of the {Mapping} {Class} {Group} ...g.}, journal = {Mathematische Annalen}, pages = {225--242}, publisher = {mathdoc}, volume = {249}, year = {1980}, zbl = {0409.57009}, url = {http://geodesic.mathdoc.fr/item/MAN_1980__249_163403/} }
Dennis Johnson. An Abelian Quotient of the Mapping Class Group ...g.. Mathematische Annalen, Tome 249 (1980), pp. 225-242. http://geodesic.mathdoc.fr/item/MAN_1980__249_163403/