@article{IM_1970__10_142038,
     author = {S. SMALE},
     title = {Topology and {Mechanics.} {I}},
     journal = {Inventiones mathematicae},
     pages = {305--331},
     publisher = {mathdoc},
     volume = {10},
     year = {1970},
     url = {http://geodesic.mathdoc.fr/item/IM_1970__10_142038/}
}