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@article{IM_1984__77_143160, author = {Francis Kirwan}, title = {Convexity properties of the moment mapping. {III.}}, journal = {Inventiones mathematicae}, pages = {547--552}, publisher = {mathdoc}, volume = {77}, year = {1984}, zbl = {0561.58016}, url = {http://geodesic.mathdoc.fr/item/IM_1984__77_143160/} }
Francis Kirwan. Convexity properties of the moment mapping. III.. Inventiones mathematicae, Tome 77 (1984), pp. 547-552. http://geodesic.mathdoc.fr/item/IM_1984__77_143160/