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@article{MZ_1978__159_172658, author = {Alan Weinstein}, title = {Bifurcations and {Hamilton's} {Principle.}}, journal = {Mathematische Zeitschrift}, pages = {235--248}, publisher = {mathdoc}, volume = {159}, year = {1978}, zbl = {0366.58003}, url = {http://geodesic.mathdoc.fr/item/MZ_1978__159_172658/} }
Alan Weinstein. Bifurcations and Hamilton's Principle.. Mathematische Zeitschrift, Tome 159 (1978), pp. 235-248. http://geodesic.mathdoc.fr/item/MZ_1978__159_172658/