Choy, Yaan Yee, Chee Tiong Ong, and Kim Gaik Tay. 2012. “NLS Equation With a Variable Coefficient in a Stenosed Elastic Tube Filled With an Averaged Inviscid Fluid”. MATEMATIKA 28 (June):1-13. https://doi.org/10.11113/matematika.v28.n.310.