Phongthanapanich, S., and R. Eymard. “A Comparative Study of Characteristic Finite Element and Characteristic Finite Volume Methods for Convection-Diffusion-Reaction Problems on Triangular Grids”. Applied Science and Engineering Progress, vol. 12, no. 4, Dec. 2019, pp. 235-42, https://ph02.tci-thaijo.org/index.php/ijast/article/view/232518.