F. Farshadmoghadam, H. Deilami Azodi, and M. R. Yaghouti, “An improved radial basis functions method for the high-order Volterra–Fredholm integro-differential equations”, Math. Sci., vol. 16, no. 4 (December 2022), Aug. 2021, doi: 10.1007/s40096-021-00432-2.