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. I. Carpathian Math. Publ. [Internet]. 2019 Dec. 31 [cited 2024 Nov. 22];11(2):228-39. Available from: https://vps.pnu.edu.ua/index.php/cmp/article/view/2103