BARANETSKIJ, Ya.O.; KALENYUK, P.I.; KOPACH, M.I.; SOLOMKO, A.V. The nonlocal boundary value problem with perturbations of mixed boundary conditions for an elliptic equation with constant coefficients. I: Array. Carpathian Mathematical Publications, [S. l.], v. 11, n. 2, p. 228–239, 2019. DOI: 10.15330/cmp.11.2.228-239. Disponível em: https://scijournals.pnu.edu.ua/index.php/cmp/article/view/2103. Acesso em: 28 mar. 2024.