Meškauskas, T., and F. Ivanauskas. “Initial Boundary-Value Problems for Derivative Nonlinear Schroedinger Equation. Justification of Two-Step Algorithm”. Nonlinear Analysis: Modelling and Control 7, no. 2 (December 5, 2002): 69–104. Accessed May 3, 2024. https://www.journals.vu.lt/nonlinear-analysis/article/view/15195.