KAKHARMAN, N. On one-dimensional Helmholtz equation. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 118, n. 2, p. 21–29, 2023. DOI: 10.26577/JMMCS.2023.v118.i2.03. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/1290. Acesso em: 4 dec. 2024.