On the variation in the cohomology of the symplectic form of the reduced phase space. Duistermaat, J. J. & Heckman, G. J. Inventiones Mathematicae, 69(2):259–268, June, 1982.
On the variation in the cohomology of the symplectic form of the reduced phase space [link]Paper  doi  bibtex   
@article{duistermaat_variation_1982,
	title = {On the variation in the cohomology of the symplectic form of the reduced phase space},
	volume = {69},
	issn = {0020-9910, 1432-1297},
	url = {http://link.springer.com/10.1007/BF01399506},
	doi = {10.1007/BF01399506},
	language = {en},
	number = {2},
	urldate = {2019-02-06},
	journal = {Inventiones Mathematicae},
	author = {Duistermaat, J. J. and Heckman, G. J.},
	month = jun,
	year = {1982},
	pages = {259--268}
}

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