@article{1104160996, author = {Angenent, S. B.}, title = {The periodic orbits of an area preserving twist map}, journal = {Comm. Math. Phys.}, volume = {113}, number = {4}, year = {1988}, pages = { 353-374}, language = {en}, url = {http://dml.mathdoc.fr/item/1104160996} }
Angenent, S. B. The periodic orbits of an area preserving twist map. Comm. Math. Phys., Tome 113 (1988) no. 4, pp. 353-374. http://gdmltest.u-ga.fr/item/1104160996/