On the number of limit cycles which appear by perturbation of Hamiltonian two-saddle cycles of planar vector fields
作者： Lubomir Gavrilov
DOI: 10.1007/S00574-011-0001-Z
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摘要: We find an upper bound to the maximal number of limit cycles, which bifurcate from a hamiltonian two-saddle loop analytic vector field, under deformation.
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