Fong, Po Ling, and Yaan Yee Choy. “Modulation of Nonlinear Waves in Viscous Fluid Contained in Stenosed Elastic Tube”. Enhanced Knowledge in Sciences and Technology, vol. 2, no. 1, Aug. 2022, pp. 163-74, https://publisher.uthm.edu.my/periodicals/index.php/ekst/article/view/5336.