Dinh . З. “Dinh D˜ung Galerkin Approximation for Parametric and Stochastic Elliptic PDEs”. BULLETIN OF THE L.N. GUMILYOV EURASIAN NATIONAL UNIVERSITY. Mathematics. Computer Science. Mechanics Series, vol. 122, no. 1, Mar. 2018, pp. 76-89, https://bulmathmc.enu.kz/index.php/main/article/view/18.