%0 Journal Article %A Sato, Masatoshi %T A class function on the mapping class group of an orientable surface and the Meyer cocycle %J Algebraic and Geometric Topology %D 2008 %P 1647-1665 %V 8 %N 3 %U http://geodesic.mathdoc.fr/articles/10.2140/agt.2008.8.1647/ %R 10.2140/agt.2008.8.1647 %F 10_2140_agt_2008_8_1647