Derivation of Sawada-Kotera and Kaup-Kupershmidt Equations KdV Flow Equations from Modified Nonlinear Schrödinger Equation (MNLS)ns from Modfied Nonlinear Schrödinger Equation (MNLS). Contemp. Math. [Internet]. 2024 Oct. 14 [cited 2025 Dec. 24];5(4):4223-34. Available from: https://ojs353.mebyme.cn/index.php/CM/article/view/4648