@article{05141431, title = {Hopf bifurcation with }, journal = {Portugaliae Mathematica. Nova S\'erie}, volume = {63}, year = {2006}, pages = {127-155}, zbl = {1113.37033}, language = {en}, url = {http://dml.mathdoc.fr/item/05141431} }
Dias, Ana Paula S.; Paiva, Rui C. Hopf bifurcation with . Portugaliae Mathematica. Nova Série, Tome 63 (2006) pp. 127-155. http://gdmltest.u-ga.fr/item/05141431/