@article{1183534664, author = {Marsden, J.}, title = {The Hopf bifurcation for nonlinear semigroups}, journal = {Bull. Amer. Math. Soc.}, volume = {79}, number = {5}, year = {1973}, pages = { 537-541}, language = {en}, url = {http://dml.mathdoc.fr/item/1183534664} }
Marsden, J. The Hopf bifurcation for nonlinear semigroups. Bull. Amer. Math. Soc., Tome 79 (1973) no. 5, pp. 537-541. http://gdmltest.u-ga.fr/item/1183534664/