TY  - JOUR
AU  - Pettet, Alexandra
TI  - The Johnson homomorphism and the second cohomology of IAn
JO  - Algebraic and Geometric Topology
PY  - 2005
SP  - 725
EP  - 740
VL  - 5
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.2140/agt.2005.5.725/
DO  - 10.2140/agt.2005.5.725
ID  - 10_2140_agt_2005_5_725
ER  -