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Abdulazeez, S.T. and Hussein , A.M. 2021. The Existence of a Polynomial Inverse Integrating Factors and Studies About the Limit Cycles for Cubic, Quartic and Quintic Polynomial Systems. Baghdad Science Journal. 18, 2 (Jun. 2021), 0322. DOI:https://doi.org/10.21123/bsj.2021.18.2.0322.