Rybalko, Ya., and D. G. Shepelsky. “Riemann-Hilbert Approach for the Integrable Nonlocal Nonlinear Schr\"Odinger Equation With Step-Like Initial Data”. Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics 880 (December 30, 2018): 4-16. Accessed November 25, 2024. https://periodicals.karazin.ua/mech_math/article/view/12134.