1.
Baranetskij Y, Kalenyuk P, Kopach M, Solomko A. The nonlocal boundary value problem with perturbations of mixed boundary conditions for an elliptic equation with constant coefficients. II. Carpathian Math. Publ. [Internet]. 2020Jun.28 [cited 2020Sep.19];12(1):173-88. Available from: https://journals.pnu.edu.ua/index.php/cmp/article/view/3902