BERIKHANOVA, G. E. Finite-dimensional perturbation Dirichlet problem for biharmonic equation. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 70, n. 3, p. 3–13, 2011. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/203. Acesso em: 22 dec. 2024.