@article{GDZPPN002099349,
title = {The Second Homology Group of the Mapping Class Group of an Orientable Surface.},
journal = {Inventiones mathematicae},
volume = {74},
year = {1983},
pages = {221-240},
zbl = {0533.57003},
url = {http://dml.mathdoc.fr/item/GDZPPN002099349}
}
Harer, John. The Second Homology Group of the Mapping Class Group of an Orientable Surface.. Inventiones mathematicae, Tome 74 (1983) pp. 221-240. http://gdmltest.u-ga.fr/item/GDZPPN002099349/