A Sufficient Condition for the uniqueness of Normal Forms and Unique Normal Forms of Generalized Hopf Singularities.

Jianping Peng Duo Wang A Sufficient Condition for the uniqueness of Normal Forms and Unique Normal Forms of Generalized Hopf Singularities. 3337-3345 2004 14 I. J. Bifurcation and Chaos 9 http://dx.doi.org/10.1142/S0218127404011247 db/journals/ijbc/ijbc14.html#PengW04