@article{1077376381, author = {Hartman, Philip}, title = {The existence and stability of stationary points}, journal = {Duke Math. J.}, volume = {33}, number = {1}, year = {1966}, pages = { 281-290}, language = {en}, url = {http://dml.mathdoc.fr/item/1077376381} }
Hartman, Philip. The existence and stability of stationary points. Duke Math. J., Tome 33 (1966) no. 1, pp. 281-290. http://gdmltest.u-ga.fr/item/1077376381/