{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T16:48:18Z","timestamp":1777913298793,"version":"3.51.4"},"reference-count":27,"publisher":"World Scientific Pub Co Pte Ltd","issue":"10","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int. J. Bifurcation Chaos"],"published-print":{"date-parts":[[2002,10]]},"abstract":"<jats:p>Some distributions of limit cycles of Z<jats:sub>2<\/jats:sub>-equivariant planar perturbed Hamiltonian polynomial vector fields of degree 5 are investigated. These include examples of specific Z<jats:sub>2<\/jats:sub>-equivariant fields and Z<jats:sub>4<\/jats:sub>-equivariant fields having up to 23 limit cycles. 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