TY  - JOUR
AU  - J.J. Duistermaat
AU  - G.J. Heckman
TI  - On the Variation in the Cohomology of the Symplectic Form of the Reduced Phase Space.
JO  - Inventiones mathematicae
PY  - 1982
SP  - 259
EP  - 268
VL  - 69
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1982__69_142953/
ID  - IM_1982__69_142953
ER  -