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Periodic solutions for nonlinear systems of integro-differential equations of Volterra- Friedholm type

In this work, we study the periodic solutions for nonlinear systems of integro-differential equations of Volterra- Friedholm. The numerical analytic method has been used by (Samoilenko A. M.) to investigate the existence and approximation of periodic solutions for certain of nonlinear systems of integro-differential equations. Also these methods could be developed and extended throughout the study.