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@article{IM_1974__26_142298, author = {Carl P. Simon}, title = {A {Bound} for the {Fixed-Point} {Index} of an {Area-Preserving} {Map} with {Applications} to {Mechanics.}}, journal = {Inventiones mathematicae}, pages = {187--200}, publisher = {mathdoc}, volume = {26}, year = {1974}, zbl = {0331.55006}, url = {http://geodesic.mathdoc.fr/item/IM_1974__26_142298/} }
Carl P. Simon. A Bound for the Fixed-Point Index of an Area-Preserving Map with Applications to Mechanics.. Inventiones mathematicae, Tome 26 (1974), pp. 187-200. http://geodesic.mathdoc.fr/item/IM_1974__26_142298/