We prove that the number of limit cycles which bifurcate from a two-saddle loop of a planar quadratic Hamiltonian system, under an arbitrary quadratic deformation, is less than or equal to three.
@article{AIHPC_2015__32_2_307_0, author = {Gavrilov, Lubomir and Iliev, Iliya D.}, title = {Perturbations of quadratic Hamiltonian two-saddle cycles}, journal = {Annales de l'I.H.P. Analyse non lin\'eaire}, volume = {32}, year = {2015}, pages = {307-324}, doi = {10.1016/j.anihpc.2013.12.001}, mrnumber = {3325239}, zbl = {06444426}, language = {en}, url = {http://dml.mathdoc.fr/item/AIHPC_2015__32_2_307_0} }
Gavrilov, Lubomir; Iliev, Iliya D. Perturbations of quadratic Hamiltonian two-saddle cycles. Annales de l'I.H.P. Analyse non linéaire, Tome 32 (2015) pp. 307-324. doi : 10.1016/j.anihpc.2013.12.001. http://gdmltest.u-ga.fr/item/AIHPC_2015__32_2_307_0/
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