H. H. J. AL-Nasrawy, A. K. O. Al-Jubor, and K. A. Hussain, “On The Higher-Order Pantograph Type Delay Differential Equation Via Orthonormal Bernstein Polynomials”, J. Al-Qadisiyah Comp. Sci. Math., vol. 12, no. 3, pp. Math Page 1– 14, Sep. 2020.