Hou, J., J. Niu, M. Xu, and W. Ngolo. “A New Numerical Method to Solve Nonlinear Volterra-Fredholm Integro-Differential Equations”. Mathematical Modelling and Analysis, vol. 26, no. 3, Sept. 2021, pp. 469-78, doi:10.3846/mma.2021.12923.