“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 88 (December 30, 2018): 4–16. Accessed November 11, 2026. https://periodicals.karazin.ua/mech_math/article/view/12134.