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@article{IM_1970__11_142044, author = {S. Smale}, title = {Topology and {Mechanics.} {II.} {The} {Planar} {n-Body} {Problem.}}, journal = {Inventiones mathematicae}, pages = {45--64}, publisher = {mathdoc}, volume = {11}, year = {1970}, zbl = {0203.26102}, url = {http://geodesic.mathdoc.fr/item/IM_1970__11_142044/} }
S. Smale. Topology and Mechanics. II. The Planar n-Body Problem.. Inventiones mathematicae, Tome 11 (1970), pp. 45-64. http://geodesic.mathdoc.fr/item/IM_1970__11_142044/