MathSciNet bibliographic data MR494274 58F10 (34C05) Ilʹjašenko, Ju. S. The multiplicity of limit cycles that arise in the perturbation of a Hamiltonian equation of the class $\omega '=P\sb{2}/Q\sb{1}$$\omega '=P\sb{2}/Q\sb{1}$ in a real and complex domain. (Russian) Trudy Sem. Petrovsk. No. 3 (1978), 49–60. Links to the journal or article are not yet available

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