@article{GDZPPN002319128,
title = {An Abelian Quotient of the Mapping Class Group ...g.},
journal = {Mathematische Annalen},
volume = {250},
year = {1980},
pages = {225-242},
zbl = {0409.57009},
url = {http://dml.mathdoc.fr/item/GDZPPN002319128}
}
Johnson, Dennis. An Abelian Quotient of the Mapping Class Group ...g.. Mathematische Annalen, Tome 250 (1980) pp. 225-242. http://gdmltest.u-ga.fr/item/GDZPPN002319128/