Nemati S, Ordokhani Y. SOLVING NONLINEAR TWO-DIMENSIONAL VOLTERRA INTEGRAL EQUATIONS OF THE FIRST-KIND USING BIVARIATE SHIFTED LEGENDRE FUNCTIONS. Int. J. Math. Model. Comput. 2015 Mar. 21;5(3):219-30. Available from: https://oiccpress.com/ijm2c/article/view/11252