ROUHPARVAR, H., and S. ABBASBANDY. “Numerical Solution of the Uncertain Characteristic Cauchy Reaction-Diffusion Equation by Variational Iteration Method”. Walailak Journal of Science and Technology (WJST), vol. 11, no. 11, Dec. 2013, pp. 987-98, https://wjst.wu.ac.th/index.php/wjst/article/view/730.