1.
Putrus R, رعد, Jameel G, غادة. The periodic solution for some systems of nonlinear integro-differential equations of Volterra type. EDUSJ [Internet]. 2008 Jun. 1 [cited 2025 Aug. 4];21(2):57-7. Available from: https://rjps.uomosul.edu.iq/index.php/edusj/article/view/18409