@article{GDZPPN002090147, title = {Homoclinic Points in Conservative Systems.}, journal = {Inventiones mathematicae}, volume = {16}, year = {1972}, pages = {267-292}, zbl = {0247.58007}, url = {http://dml.mathdoc.fr/item/GDZPPN002090147} }
Takens, Floris. Homoclinic Points in Conservative Systems.. Inventiones mathematicae, Tome 16 (1972) pp. 267-292. http://gdmltest.u-ga.fr/item/GDZPPN002090147/