Semisalov, B. 2016. A fast nonlocal algorithm for solving Neumann-Dirichlet boundary value problems with error control. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie). 17, 50 (Nov. 2016), 500–522. DOI:https://doi.org/10.26089/NumMet.v17r446.