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@article{CMH_1979__54_139793, author = {John N. Mather}, title = {Area preserving twist homeomorphism of the annulus.}, journal = {Commentarii mathematici Helvetici}, pages = {397--404}, publisher = {mathdoc}, volume = {54}, year = {1979}, zbl = {0414.57002}, url = {http://geodesic.mathdoc.fr/item/CMH_1979__54_139793/} }
John N. Mather. Area preserving twist homeomorphism of the annulus.. Commentarii mathematici Helvetici, Tome 54 (1979), pp. 397-404. http://geodesic.mathdoc.fr/item/CMH_1979__54_139793/