@article{GDZPPN002063492, title = {Area preserving twist homeomorphism of the annulus.}, journal = {Commentarii mathematici Helvetici}, volume = {54}, year = {1979}, pages = {397-404}, zbl = {0414.57002}, url = {http://dml.mathdoc.fr/item/GDZPPN002063492} }
Mather, John N. Area preserving twist homeomorphism of the annulus.. Commentarii mathematici Helvetici, Tome 54 (1979) pp. 397-404. http://gdmltest.u-ga.fr/item/GDZPPN002063492/