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@article{DOCMA_1997__2__a11, author = {Leis, Christian}, title = {Hopf-bifurcation in systems with spherical symmetry. {I:} {Invariant} tori}, journal = {Documenta mathematica}, pages = {61--113}, publisher = {mathdoc}, volume = {2}, year = {1997}, language = {en}, url = {http://geodesic.mathdoc.fr/item/DOCMA_1997__2__a11/} }
Leis, Christian. Hopf-bifurcation in systems with spherical symmetry. I: Invariant tori. Documenta mathematica, Tome 2 (1997), pp. 61-113. http://geodesic.mathdoc.fr/item/DOCMA_1997__2__a11/