@article{GDZPPN002420554, title = {Bifurcations and Hamilton's Principle.}, journal = {Mathematische Zeitschrift}, volume = {162}, year = {1978}, pages = {235-248}, zbl = {0366.58003}, url = {http://dml.mathdoc.fr/item/GDZPPN002420554} }
Weinstein, Alan. Bifurcations and Hamilton's Principle.. Mathematische Zeitschrift, Tome 162 (1978) pp. 235-248. http://gdmltest.u-ga.fr/item/GDZPPN002420554/