فهرس المقالات System of Volterra integral equations حرية الوصول المقاله صفحة الملخص نص كامل 1 - A three-step method based on Simpson's 3/8 rule for solving system of nonlinear Volterra integral equations M. Tavassoli-Kajani L. Kargaran-Dehkordi Sh. Hadian-Jazi