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Hamiltonian Hopf bifurcation of the hydrogen atom in crossed fields Efstathiou K., Cushman R.H., Sadovskii D.A. Physica D: Nonlinear Phenomena 194 (2004) 250-274 [hal-00019569 - version 1]

Linear Hamiltonian Hopf bifurcation for point group invariant perturbation of the 1:1:1 resonance Efstathiou K., Sadovskii D.A., Cushman R.H. Proceedings of the Royal Society of London ser., A459 vol 2040 (2003) 2997-3019 [hal-00019559 - version 1]