“Optimum finite-element method for domains of complex form (a Dirichlet problem for an equation with elliptic differential operator of 2-nd order)” (1999) Neliniini Kolyvannya, 2(2), pp. 217–224. Available at: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/56 (Accessed: 22 January 2026).