TY  - JOUR
AU  - Christian Leis
TI  - Hopf-bifurcation in systems with spherical symmetry. I: Invariant tori
JO  - Documenta mathematica
PY  - 1997
SP  - 61
EP  - 113
VL  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4171/dm/24/
DO  - 10.4171/dm/24
ID  - 10_4171_dm_24
ER  -