KANGUZHIN, B. E.; NURAKHMETOV, D. B. Correct boundary value problems for 2-order in nonhomogeneous differential equation with variable coefficients. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 64, n. 1, p. 9–26, 2019. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/590. Acesso em: 22 dec. 2024.