“The method of constructing of Dirichlet boundary value problem basis for variational methods” (2016) Bulletin of V.N. Karazin Kharkiv National University, series «Mathematical modeling. Information technology. Automated control systems», 31(1), pp. 5–15. Available at: https://periodicals.karazin.ua/mia/article/view/6804 (Accessed: 25 October 2026).