@article{PMIHES_1990__71__105_0, author = {Franks, John}, title = {Periodic points and rotation numbers for area preserving diffeomorphisms of the plane}, journal = {Publications Math\'ematiques de l'IH\'ES}, volume = {72}, year = {1990}, pages = {105-120}, mrnumber = {92b:58182}, zbl = {0721.58031}, language = {en}, url = {http://dml.mathdoc.fr/item/PMIHES_1990__71__105_0} }
Franks, John. Periodic points and rotation numbers for area preserving diffeomorphisms of the plane. Publications Mathématiques de l'IHÉS, Tome 72 (1990) pp. 105-120. http://gdmltest.u-ga.fr/item/PMIHES_1990__71__105_0/
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