Zhou , Xin-MeiTian , Shou-FuYang , Jin-Jie and Mao , Jin-Jin. (2020). The Riemann-Hilbert Approach and $N$-Soliton Solutions of a Four-Component Nonlinear Schrödinger Equation.
East Asian Journal on Applied Mathematics. 11 (1).
143-163.
doi:10.4208/eajam.100620.170920