M. H. Hooi, W. K. Tiong, K. G. Tay, S. N. Sze, and K. L. Chiew, “Simulation of Internal Undular Bores Propagating over a Slowly Varying Region”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 9, no. 5, pp. 1754–1760, Oct. 2019.