Rybalko, Y. and Shepelsky, D.G. 2018. 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, (Dec. 2018), 4-16. DOI:https://doi.org/10.26565/2221-5646-2018-88-01.