Semisalov, B.V. “A Fast Nonlocal Algorithm for Solving Neumann-Dirichlet Boundary Value Problems With Error Control”. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie) 17, no. 50 (November 26, 2016): 500–522. Accessed September 19, 2024. https://en.num-meth.ru/index.php/journal/article/view/909.