Periodic points and rotation numbers for area preserving diffeomorphisms of the plane
Publications Mathématiques de l'IHÉS, Tome 71 (1990), pp. 105-120. 
@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},
     pages = {105--120},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {71},
     year = {1990},
     mrnumber = {1079645},
     zbl = {0721.58031},
     language = {en},
     url = {http://www.numdam.org/item/PMIHES_1990__71__105_0/}
}
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Franks, John. Periodic points and rotation numbers for area preserving diffeomorphisms of the plane. Publications Mathématiques de l'IHÉS, Tome 71 (1990), pp. 105-120. http://www.numdam.org/item/PMIHES_1990__71__105_0/

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