%0 Journal Article
%A Pettet, Alexandra
%T The Johnson homomorphism and the second cohomology of IAn
%J Algebraic and Geometric Topology
%D 2005
%P 725-740
%V 5
%N 2
%U http://geodesic.mathdoc.fr/articles/10.2140/agt.2005.5.725/
%R 10.2140/agt.2005.5.725
%F 10_2140_agt_2005_5_725