KANGUZHIN, B.; TOKMAGAMBETOV, N. A boundary inverse problem for a second order differential operator. International Journal of Mathematics and Physics, [S. l.], v. 5, n. 2, p. 24–30, 2014. DOI: 10.26577/2218-7987-2014-5-2-24-30. Disponível em: https://ijmph.kaznu.kz/index.php/kaznu/article/view/91. Acesso em: 8 may. 2024.