Iranian Mathematical Society (IMS) Bulletin of the Iranian Mathematical Society 1017-060X 32 No. 1 2011 01 22 Tau Numerical Solution of Volterra Integro-Differential Equations With Arbitrary Polynomial Bases33 44 en J. Pour-Mahmoud M. Y. Rahimi S. Shahmorad 2011 01 22 Tau method Integral and integro-diffrential equation