@article{GDZPPN00248434X,
title = {A Hopf Bifurcation Theorem for Difference Equations Approximating a Differential Equation.},
journal = {Monatshefte f\"ur Mathematik},
volume = {98},
year = {1984},
pages = {99-114},
zbl = {0546.58037},
url = {http://dml.mathdoc.fr/item/GDZPPN00248434X}
}
Hofbauer, J.; Iooss, G. A Hopf Bifurcation Theorem for Difference Equations Approximating a Differential Equation.. Monatshefte für Mathematik, Tome 98 (1984) pp. 99-114. http://gdmltest.u-ga.fr/item/GDZPPN00248434X/