Nemati, S., & Ordokhani, Y. (2015). SOLVING NONLINEAR TWO-DIMENSIONAL VOLTERRA INTEGRAL EQUATIONS OF THE FIRST-KIND USING BIVARIATE SHIFTED LEGENDRE FUNCTIONS. International Journal of Mathematical Modelling & Computations, 5(3), 219-230. https://oiccpress.com/ijm2c/article/view/11252