@article{02221860,
title = {The Johnson homomorphism and the second cohomology of },
journal = {Geometry \& Topology},
volume = {5},
year = {2005},
pages = {725-740},
doi = {10.2140/agt.2005.5.725},
zbl = {1085.20016},
language = {en},
url = {http://dml.mathdoc.fr/item/02221860}
}
Pettet, Alexandra. The Johnson homomorphism and the second cohomology of . Geometry & Topology, Tome 5 (2005) pp. 725-740. doi : 10.2140/agt.2005.5.725. http://gdmltest.u-ga.fr/item/02221860/