%0 Journal Article
%A J.J. Duistermaat
%A G.J. Heckman
%T On the Variation in the Cohomology of the Symplectic Form of the Reduced Phase Space.
%J Inventiones mathematicae
%D 1982
%P 259-268
%V 69
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1982__69_142953/
%F IM_1982__69_142953