@article{TM_1997_216_a23,
     author = {F. Takens},
     title = {Chaos in systems beyond hyperbolicity},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {364--369},
     publisher = {mathdoc},
     volume = {216},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM_1997_216_a23/}
}