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@article{MS2_1983__52_166843, author = {I. Ekeland}, title = {Some lemmas about dynamical systems.}, journal = {Mathematica Scandinavica}, pages = {262--268}, publisher = {mathdoc}, volume = {52}, year = {1983}, zbl = {0515.58026}, url = {http://geodesic.mathdoc.fr/item/MS2_1983__52_166843/} }
I. Ekeland. Some lemmas about dynamical systems.. Mathematica Scandinavica, Tome 52 (1983), pp. 262-268. http://geodesic.mathdoc.fr/item/MS2_1983__52_166843/